Question

Antihistamine drugs are effective against a
A. Bacterial infection
B. Viral infection
C. Paraplegia
D. Allergy

Answer 1

Hint: In pharmacology drug is a chemical substance in which we know the chemical structure and which when we administer to a living organism will give a biological effect. A pharmaceutical drug is also called medicine or medication which is used to treat, prevent, cure, and diagnose a disease or to promote wellbeing.

Complete answer:Bacterial infections- Infectious bacteria will make us ill. They can reproduce quickly in our bodies. They give out a chemical substance which is called toxins, which can damage the tissues and make us very sick. Bacterial infections can be treated by some antibacterial drugs.
Viral infection- A virus will proliferate in our body. A virus cannot replicate on its own; it needs a host so that it uses the host machinery and replicates itself and infects the other cells in the body. A virus usually acts as a hijacker by hijacking the body's cells. It can be treated through some antiviral drugs.
Paraplegia- When there is impairment in the motor or sensory function Paraplegia occurs. It affects the spinal cord or congenital condition which affects the neural elements of the spinal cord. The area which is usually affected is the thorax, sacral regions, or lumbar. If four limbs are affected paralysis will occur. To treat paraplegia the patient should take physiotherapy.
Allergy- allergy is the immune system response when our body comes across foreign substances that are not that harmful to our body. The foreign substance is called an allergen. The allergens are pollen, dust, pets, food, etc. Allergy is an immune system response to a foreign substance that’s not typically harmful to your body. We can treat allergies by taking antihistamine drugs.
Hence the answer is option D, allergy.

Note: Antihistamines are drugs that will block the effects of a substance called histamine in our body. Histamines are usually released when our body detects harmful substances such as allergens. This causes the blood vessels to expand and the skin to swell, teary eyes, sneezing which helps our body to protect against the allergens.