The correct option is
D Adenoids
Adenoids, also called Pharyngeal tonsils, a mass of lymphatic tissue, similar to the tonsils, that is attached to the back wall of the nasal pharynx (i.e., the upper part of the throat opening into the nasal cavity proper). An individual fold of such nasopharyngeal lymphatic tissue is called an adenoid.So, the correct option is 'Adenoids'.