This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatitis, Subject name: Pathology
Commonest risk factor for HCV infection is: 
Select and explain. 
A. i.v. drug abuse, B. Multiple sex paners, C. Surgery within last 6 months, D. Multiple contacts with HCV infected person
A: i.v. drug abuse
Answer: A: i.v. drug abuse 
Explanation: Most common risk factors for HCV infection are: Intravenous drug abuse (54%) Multiple sex paners (36%) Having had surgery within the last 6 month (16%) Needle stick injury (10%) Multiple contacts with an HCV-infected person (10%) Employment in medical or dental fields (1.5%)