system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 60-year-old man comes to the physician’s office with jaundice. Liver ultrasound reveals a shrunken liver and biopsy reveals cirrhosis. Hepatitis serologies are below:

Anti-HAV: negative
HBsAg: negative
HBsAb: positive
HBeAg: negative
Anti-HBe: negative
Anti-HBc: negative
Anti-HCV: positive

The hepatitis C viral load is 1,000,000 copies/mL. The patient is started on an antiviral regimen including sofosbuvir. What is the mechanism of action of this drug?
assistant
Inhibits RNA-dependent RNA polymerase