This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Bile ductopenia seen in \nSelect and explain. \nA. GVHD, B. Alcoholic hepatitis, C. Autoimmune hepatitis, D. Cirrhosis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ductopenia Ductopenia refers to a reduction in the number of ducts in an organ. It is the histological hallmark of vanishing bile duct syndrome (typically <0.5 bile ducts per poal triad). The most common cause of ductopenia is primary biliary cholangitis. Other causes failing liver transplant Hodgkin's lymphoma graft-versus-host disease (GVHD) sarcoid cytomegalovirus infection, HIV medication toxicity. Ref: Harrison's 19th edition Pgno :2027-2028", 'role': 'assistant'}]