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': 'The mechanism of action of Sofosbuvir? \nSelect and explain. \nA. Inhibits RNA dependent RNA polymerase of HCV, B. Inhibits DNA dependent RNA polymerase of HCV, C. Inhibits RNA dependent RNA polymerase of HBV, D. Inhibits DNA dependent RNA polymerase of HBV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sofosbuvir is used orally for Hep C. Orally given once daily in combination with ledipasvir or ribavirin or PEG-interferon for 24 weeks. It is a Hep C NS5B polymerase inhibitor. Ref: HL.Sharma 3rd ed. Pg 800', 'role': 'assistant'}]