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
Chronic active hepatitis is distinguished from chronic persistent hepatitis by - 
Select and explain. 
A. Characteristic liver pathology, B. HBS Ag in serum, C. Extrahepatic manifestations, D. Presence of anti smooth muscle antibody
A: Characteristic liver pathology
Answer: A: Characteristic liver pathology 
Explanation: None