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 diagnosis of chronic hepatitis is made if liver disease is present for a minimum of: 
Select and explain. 
A. 3 weeks, B. 6 weeks, C. 6 months, D. 3 months
C: 6 months
Answer: C: 6 months 
Explanation: None