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': 'Hoarseness secondary to bronchogenic carcinoma is usually due to extension of the tumour into - \nSelect and explain. \nA. Vocal cord, B. Superior laryngeal nerve, C. Left recurrent laryngeal nerve, D. Right vagus nerve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]