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: ENT
[{'content': 'Not a contraindication of routine Tonsillectomy - \nSelect and explain. \nA. Upper respiratory tract infections, B. Bleeding disorder, C. Diphtheria carriers, D. Cleft palate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]