This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Plica triangularis is present in 
Select and explain. 
A. Antero-inferior pa of tonsil, B. Dorsum of tongue, C. Inlet of larynx, D. None
A: Antero-inferior pa of tonsil
Answer: A: Antero-inferior pa of tonsil 
Explanation: The plica triangularis is a triangular vestigeal fold of mucous membrane covering the anteroinferior pa of the tonsil. The plica semilunaris, is a similar semilunar fold that may cross the upper pa of the tonsillar sinus. Ref: BD Chaurasia's HUMAN ANATOMY, Volume 3, 4th edition.