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: Physiology
Most common sign of airway obstruction 
Select and explain. 
A. Slow pounding pulse, B. Strenuous breathing, C. Increase pulse rate, D. Decrease pulse rate
B: Strenuous breathing
Answer: B: Strenuous breathing 
Explanation: None