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': 'The commonest cause of hoarseness of voice in elderly man of more than 3 months duration- \nSelect and explain. \nA. Cancer larynx, B. Chronic bronchitis, C. Acute laryngitis, D. Nodular goitre', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]