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
Transient erythroid hypoplasia in hereditary spherocytosis is caused by: 
Select and explain. 
A. Epstein Barr virus, B. Parvovirus B19, C. CMV, D. Hepatitis B
B: Parvovirus B19
Answer: B: Parvovirus B19 
Explanation: 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.