Which of the following is a protective reflex involved in swallowing?

• A. gag reflex
• B. coughing reflex
• C. hiccup reflex
• D. sneeze reflex

Answer: (A)

The gag reflex is a protective mechanism that guards the airway during swallowing. When the back of the tongue or the pharynx is stimulated, sensory input travels via the glossopharyngeal nerve and triggers a motor response through the vagus nerve, producing pharyngeal constriction and sometimes a retching-like reaction. This helps prevent material from entering the airway and supports safe swallowing by quickly stopping or modulating the swallow if something threatens aspiration. Other reflexes listed are more about clearing the airway after material has entered it (cough), or are not directly tied to protecting swallowing (hiccup, sneeze), making the gag reflex the most directly protective in this context.