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 voice is not affected in: \nSelect and explain. \nA. Unilateral abductor palsy, B. Unilateral adductor palsy, C. B/L superior laryngeal palsy, D. Total adductor palsy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In U/L abductor palsy, the affected vocal cord assumes a median or paramedian position. The other is normal so one third patients are asymptomatic while others may have some voice change.', 'role': 'assistant'}]