Question

The eggs of which parasite are bile stained
A. Ascaris lumbricoides
B. Ancylostoma duodenale
C. Enterobius vermicularis
D. Necator Americans

Answer 1

Hint: The parasite is an organism that lives on or inside the body of the host organisms to obtain its food from the host. The parasite causes harm to the host during the process of obtaining their nutrition from them.

Complete answer:
Let us analyze the options to find out the correct answer.
Option A: Ascaris lumbricoides is also called roundworm which belongs to the class Chromadorea and phylum Nematoda. This parasite infects the human body through fecal and oral route. The infected host releases their stool having the presence of fertilized and unfertilized eggs of Ascaris lumbricoides of which the fertilized eggs are round and have a layer of bile over them. This layer is developed when they pass through the excreta of humans. Therefore, this is the correct option.

Option B: Larvae of Ancylostoma duodenale matures into an adult in the intestine. They can produce nearly 25,000-26,000 eggs per day which can be released in the feces. They develop on the soil in the presence of proper moisture and environmental conditions. They are also called intestinal hookworms. Therefore, this is the incorrect option.

Option C: Enterobius vermicularis is also called human pinworm which measures 20-60 micrometre in length. Therefore, this is the incorrect option.

Option D: Necator Americans are associated with blood loss and anemia in patients they infect. It is a species of hookworm. Therefore, this is the incorrect option.

Hence, the correct answer is option (A)

Note: Ascaris lumbricoides causes infection in the host whose symptoms include nausea, vomiting, abdominal pain, loss of appetite, etc. They are mainly found in children.