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: Pathology
Persistent marrow aplasia is caused by which hepatitis virus: September 2006 
Select and explain. 
A. HAV, B. HBV, C. HCV, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: Ans. D: None of the abovePersistent marrow aplasia appear after a variety of viral infections, most commonly viral hepatitis of the non-A, non-B, non-C, non-G type, which is associated with 5% to 10% of cases.