This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology, Subject name: Microbiology
[{'content': 'Child having perianal pruritus with following eggs is due to: \nSelect and explain. \nA. E. vermicularis, B. Ascaris, C. Ankylostoma duodenale, D. S. stercoralis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., E. Vermicularis(Ref: Harrison, 19th/e, p. 1416)* Most pinworm infections are asymptomatic, the others name of Enterobius vermicularis are Pinworm, threadworm, seatworm.* Perianal pruritis is the cardinal symptom. The itching is worse at night and disturbes sleep.* Heavy infections can cause abdominal pain and weight loss.* NIH swab is used for diagnosis.", 'role': 'assistant'}]