This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gall Bladder & Bile Ducts, Subject name: Surgery
Causes of Acalculous cholecystitis are the following except 
Select and explain. 
A. Bile duct stricture, B. Schistosomiasis, C. Prolonged TNP, D. Major operations
B: Schistosomiasis
Answer: B: Schistosomiasis 
Explanation: Ans. (b) SchistosomiasisRef: Sabiston Page 1508, 20th editionRisk factors of Acalculous cholecystitis:* Old age* Critical illness* Burns* Prolonged TPN* Major operations* Diabetes* Immunosuppression