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: Anatomy
[{'content': 'Unilateral palsy of external laryngeal nerve leads to \nSelect and explain. \nA. Aphonia, B. Hoarseness of voice, C. Paralysis, D. Loss of timber of voice', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]