This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
Which is the most common preceding infection in bone marrow failure syndromes? 
Select and explain. 
A. Parvo B19, B. EBV, C. HIV, D. Hepatitis
D: Hepatitis
Answer: D: Hepatitis 
Explanation: Most common infection preceding bone marrow failure syndrome is hepatitis. It is usually sero negative ( non-A, non- B, non - C ). It accounts for 5% of etiologies. Parvo virus can cause pure red cell aplasia, but it doesn't usually cause generalised bone marrow failure. Ref: Harrison's principles of internal medicine, 21st edition, page 664