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: Microbiology
[{'content': 'Cultivable (in vitro) hepatitis virus is- \nSelect and explain. \nA. Hepatitis A, B. Hepatitis B, C. Hepatitis C, D. Hepatitis D', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hepatitis A virus can be grown in some human and simian cell cultures\nIt is the only human hepatitis virus which can be cultivated in vitro', 'role': 'assistant'}]