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': "Dohlman's operation is related to - \nSelect and explain. \nA. Carcinoma esophagus, B. Carcinoma larynx, C. Zenker's diverticulum, D. Nasal carcinoma", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]