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': 'Electron microscopy is helpful in diagnosis of ? \nSelect and explain. \nA. Rotavirus, B. RSV, C. Herpesvirus, D. Prion', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Rotavirus", 'role': 'assistant'}]