This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
[{'content': 'An oral drug approved for the treatment of Hepatitis C? \nSelect and explain. \nA. Ledipsavir, B. Rimantidine, C. Telbivudine, D. Entecavir', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ledipsavir is a direct acting antiviral drug used to treat chronic Hep C . It is used in combination with sofosbuvir. trade name being Harvoni Ref: Goodman n Gillman 13th ed.', 'role': 'assistant'}]