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': 'Smallest Virus is ? \nSelect and explain. \nA. Herpes virus, B. Adenovirus, C. Parvovirus, D. Poxvirus', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is `c' i.e. Parvovirus", 'role': 'assistant'}]