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
Which of the following infection is most commonly related to aplastic anemia? 
Select and explain. 
A. Hepatitis, B. H. pylori infection, C. Tetanus, D. Bacteremia
A: Hepatitis
Answer: A: Hepatitis 
Explanation: Hepatitis is the most common preceding infection and posthepatitis marrow failure accounts for approximately 5% of etiologies in most series.