This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatic encephalopathy & hepatic failure, Subject name: Medicine
[{'content': 'Most common cause of Fulminant hepatic failure? \nSelect and explain. \nA. HAV, B. HBV, C. HCV, D. HDV', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hepatitis D virus Hepatitis D accounts for maximum number of fulminant cases of viral hepatitis, a sizable propoion of which are associated with HBV infection. Superinfection with HDV in patients of chronic hepatitis B infection leads to fulminant hepatic failure', 'role': 'assistant'}]