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: Pathology
[{'content': 'Low serum haptoglobin in hemolysis masked as - \nSelect and explain. \nA. Pregnancy, B. Liver disease, C. Bile duct obstruction, D. Malnutrition', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . Bile duct obstruction', 'role': 'assistant'}]