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: Medicine
[{'content': "Chron's disease may produce all the following except \nSelect and explain. \nA. Vesicovaginal fistula, B. Perianal fistula, C. Jejunocolic fistula, D. Rectovesical fistula", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]