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': 'NIH swab is used to demonstrate \nSelect and explain. \nA. Enterobius, B. Trichuris, C. Ancyclostoma, D. Necator', 'role': 'user'}, {'content': 'Answer: A \nExplanation: NIH (National Institute of health swab) is used in diagnosis of Enterobius.', 'role': 'assistant'}]