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': 'All are true regarding typhoid ulcer, except - \nSelect and explain. \nA. Ileum is common site, B. Bleeding is common, C. Stricture is usual and causes obstruction, D. Perforation is common', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]