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Allergy that occurs throughout the year is called _______allergy.
A)Seasonal
B)Perennial
C)Biennial
D)Annual

Answer
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Hint: Allergies are one’s body's reaction to a substance it views as a harmful invader. Coming into contact with what's normally a harmless substance, like pollen causes the system to react and also the substances which cause these sort of reactions are allergens.

Complete answer:
Allergies usually don't occur at the primary exposure. When someone is exposed to an allergen for the primary time, the body develops molecules called antibodies against the invading proteins. This can be called an immunologic response.

When exposed to the allergen again the system produces large amounts of antibodies that result in break-down of mast cells that contain chemicals like histamine. This results in the features of allergies.

Symptoms of allergy include:
1.Sneezing
2.Shortness of breath
3.Wheezing
4.Runny nose and eyes
5.Pain over the sinuses
6.Coughing
7.Skin rashes
8.Swelling of the lips or face
9.Itching eyes, ears, lips, throat and roof of the mouth
10.Nausea
11.Vomiting
12.Abdominal cramps and diarrhea

Seasonal allergies, sometimes called "hay fever" or seasonal coryza, are allergy symptoms that happen during certain times of the year, usually when outdoor molds release their spores, and trees, grasses, and weeds release tiny pollen particles into the air to fertilize other plants.

Types:
a.Spring: Trees are liable for most springtime seasonal allergies. Some of the allergenic trees are cedar, alder, horse chestnut, willow, and poplar.

b.Summer: Hay fever gets its name from hay-cutting season, which is traditionally within the summer months. But the 000 culprits of summertime seasonal allergies are grasses, like ryegrass and timothy grass, still as certain weeds. In keeping with the Asthma and Allergy Foundation of America, grasses are the foremost common trigger for people with allergic rhinitis.

c.Fall: Autumn is ragweed season. The genus name for ragweed is Ambrosia, and it includes over 40 species worldwide. Most of them grow in temperate regions of North and South America. They’re invasive plants that are difficult to regulate. Their pollen may be a quite common allergen, and also the symptoms of ragweed allergy may be especially severe.
Other plants that drop their pollen within the fall include nettles, mugworts, sorrels, fat hens, and plantains.

d.Winter: By winter, most outdoor allergens lie dormant. As a result, atmospheric conditions bring relief to several people with allergic rhinitis. But it also means more folks are spending time indoors. If you’re liable to seasonal allergies, also react to indoor allergens, like mold, pet dander, dust mites, or cockroaches.

Perennial allergies may occur at any time of year—unrelated to the season—or may last year-round. Perennial allergies are often a reaction to deal with dust. House dust may contain mold and fungal spores, fibers of cloth, animal dander, dust mite droppings, and bits of insects. Substances in and on cockroaches are often the reason behind allergic symptoms. These substances are present in houses year-round but may cause severe symptoms during winter months when longer time is spent indoors.

Hence, the correct answer is option (B)

Note: Usually, perennial allergies cause nasal symptoms (allergic rhinitis) but not eye symptoms (allergic conjunctivitis). However, allergic conjunctivitis may end up when allergens are inadvertently rubbed into the eyes. The cleaning solutions for contact lenses may also sometimes cause hypersensitivity. Perennial rhinitis is commonly caused by something aside from an allergy, like aspirin or another anti-inflammatory drug (NSAID) or another type of rhinitis.