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
Symptom of sudden onset bilateral vocal cord palsy - 
Select and explain. 
A. Dyspnea & Stridor, B. Hoarseness of voice, C. Asymptomatic, D. Bovine cough
A: Dyspnea & Stridor
Answer: A: Dyspnea & Stridor 
Explanation: Sudden onset of bilateral vocal cord paralysis produces respiratory obstruction with dysnea and stridor.