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
All of the following conditions are associated with pneumobilia except 
Select and explain. 
A. Sphincterotomy, B. Rupture of hydatid cyst, C. Mirriz's syndrome, D. Gallstone ileus
B: Rupture of hydatid cyst
Answer: B: Rupture of hydatid cyst 
Explanation: Causes of pneumobilia Previous surgery (papillotomy, choledochojejunostomy, ERCP with sphincterectomy) Gallstone ileus Emphysematous cholecystitis Choledochoduodenal or cholecystocolic fistula Tracheobiliary fistula Suppurative cholangitis Mirriz's syndrome (Due to cholecystoenteric fistula) Ref: Sabiston 20th edition Pgno :1570