This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
[{'content': 'A patient is having carcinoma larynx. The most likely other area having a second primary (synchronous second primary) is: \nSelect and explain. \nA. Cancer base of tongue, B. Cancer oesophagus, C. Carcinoma bronchus, D. Carcinoma nasopharynx', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cancer lung is commonly associated with laryngeal cancer. However, any other area of aerodigestive tract may show synchronous second primary.', 'role': 'assistant'}]