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': 'Transient erythroid hypoplasia in hereditary spherocytosis is caused by: \nSelect and explain. \nA. Epstein Barr virus, B. Parvovirus B19, C. CMV, D. Hepatitis B', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Parvovirus B 19 can cause transient red cell aplasia in patients with hemolytic disorders. It can cause aplastic crisis. Ref: Harrisons principles of internal medicine, 18th edition, Page 874.', 'role': 'assistant'}]