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
Low serum haptoglobin in hemolysis masked as - 
Select and explain. 
A. Pregnancy, B. Liver disease, C. Bile duct obstruction, D. Malnutrition
C: Bile duct obstruction
Answer: C: Bile duct obstruction 
Explanation: . Bile duct obstruction