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: Surgery
Absence of which of the following protective reflex is suggestive of airway obstruction: 
Select and explain. 
A. Sneezing., B. Coughing., C. Gag reflex., D. None.
B: Coughing.
Answer: B: Coughing. 
Explanation: None