Which organ located in the pharynx protects against pathogens?

• A. Esophagus
• B. Tonsils
• C. Epiglottis
• D. Larynx

Answer: (B)

Tonsils are clusters of lymphoid tissue located in the pharynx that act as a first line of immune defense. They sample bacteria and viruses entering through the mouth or nose and mount an immune response by activating antibodies and lymphocytes, helping to prevent infection in the throat area. The esophagus is a passage for food, the epiglottis mainly shields the airway during swallowing, and the larynx functions in voice and airway protection but is not the pharyngeal lymphoid tissue responsible for immune defense.