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
[{'content': 'A person who had undergone gastrojejunostomy suddenly develops severe diarrhoea. Which should be suspected - \nSelect and explain. \nA. Gastric carcinoma, B. Tb abdomen, C. Gastrojejunocolic fistula, D. Gastric amoebiasis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]