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: Medicine
[{'content': 'Aplastic anemia in sickle cell anemia is due to infection of - \nSelect and explain. \nA. Herpes, B. Parvovirus B19, C. CMV, D. Papova', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]