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': 'Only hepatitis virus which can be cultured is \nSelect and explain. \nA. >HAV, B. >HBV, C. >HDV, D. >HCV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HAV Hepatitis A virus can be grown in some human and simian cultures and it is the only human hepatitis virus which can be cultivated in vitro. It has also been cloned.', 'role': 'assistant'}]