This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'A child having perianal pruritus with following eggs is due to - \nSelect and explain. \nA. E. vermicularis, B. Ascaris, C. Ancylostoma duodenale, D. Strongyloides stercoralis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]