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 doesn't include 
Select and explain. 
A. Pheumobilia, B. Ectopic stone, C. Cholangitis, D. Intestinal obstruction
C: Cholangitis
Answer: C: Cholangitis 
Explanation: Rigler's triad is a combination of findings on an abdominal radiograph of people with gallstone ileus, a condition where a large gallstone causes bowel obstruction.it consists of 
(a) Small bowel obstruction,
(b) a gallstone outside the gallbladder
(c) air in the bile ducts(pneumobilia).