Final answer:
The pharyngeal tonsil, also known as the adenoid, has enlarged adenoids due to pathogens. It is located on the roof of the posterior superior wall of the nasopharynx. Swelling of the pharyngeal tonsil indicates an active immune response to infection.
Step-by-step explanation:
The tonsil that has enlarged adenoids due to pathogens is the pharyngeal tonsil, also known as the adenoid. The pharyngeal tonsil is located on the roof of the posterior superior wall of the nasopharynx. It contains a rich supply of lymphocytes and traps and destroys invading pathogens that enter during inhalation. Swelling of the pharyngeal tonsil indicates an active immune response to infection.