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': 'Symptom of sudden onset bilateral vocal cord palsy - \nSelect and explain. \nA. Dyspnea & Stridor, B. Hoarseness of voice, C. Asymptomatic, D. Bovine cough', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sudden onset of bilateral vocal cord paralysis produces respiratory obstruction with dysnea and stridor.', 'role': 'assistant'}]