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: Medicine
A 42 years old male patient presented with jaundice. His AST was 48 U, ALT was 51 U, ALP, GGTP were normal. Ultrasound of liver was suggestive of cirrhosis. Viral markers were done and the following results were obtained.TestResultAnti-HAVNegativeAnti-HBsAgNegativeAnti-HBeAgNegativeAnti-HBcAg IgGPositiveAnti-HBcAg IgMNegativeHBsAgNegativeAnti-HCVPositiveAnti-HEVNegativeWhat is the next best step in management of this patient? 
Select and explain. 
A. Sta interferon therapy, B. Liver biopsy, C. -PCR for hepatitis C virus, D. PCR for HBV-DNA
C: -PCR for hepatitis C virus
Answer: C: -PCR for hepatitis C virus 
Explanation: Ans: C. -PCR for hepatitis C virus(Ref Harrison 19/e p2017, 2018: 18/e p2551)Positive Anti-HBcAg IgG:Mere indicator of hepatitis B infection in past.Positive Anti-HCV antibody:Most sensitive indicator of HCV infection - Presence of HCV.Presence of Anti-HCV antibody points to hepatitis C infection a Hence HCV-RNA levels determined to establish chronic hepatitis C diagnosis before staing Interferon therapy.Requires molecular amplification by PCR.Testing for HCV RNA or repeat anti-HCV testing later stages - Necessary to establish diagnosis.