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: Surgery
[{'content': "Rigler's triad doesn't includes \nSelect and explain. \nA. Pheumobilia, B. Ectopic stone, C. Cholangitis, D. Intestinal obstruction", 'role': 'user'}, {'content': "Answer: C \nExplanation: 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). Reference:SRB's manual of surgery,5th edition,page no:649", 'role': 'assistant'}]