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: Surgery
Rigler's triad consist of all, except: 
Select and explain. 
A. Intestinal obstruction, B. Cholangitis, C. Gas in bile duct, D. Ectopic gallstone
B: Cholangitis
Answer: B: Cholangitis 
Explanation: The triad indicates gallstone ileus. Rigler's triad is: Ectopic gallstone Paial or complete bowel obstruction Gas in the gallbladder or in biliary tree Ref: Sabiston, 18th Edition, Page 1572