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': 'Which of the following is not a precancerous condition to colon - \nSelect and explain. \nA. Irritable bowel syndrome, B. Ulcerative colitis, C. Familial polyposis, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]