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
[{'content': 'Plica triangularis is present in \nSelect and explain. \nA. Antero-inferior pa of tonsil, B. Dorsum of tongue, C. Inlet of larynx, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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.", 'role': 'assistant'}]