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': "All of the following are pre-malignant except: \nSelect and explain. \nA. Crohn's disease, B. Ulcerative colitis, C. Peutz-Jegher's syndrome, D. Barrett's esophagus", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. c. Peutz-Jegher's syndrome", 'role': 'assistant'}]