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': 'Location of pyriform fossa \nSelect and explain. \nA. Nasopharynx, B. Oropharynx, C. Laryngeal pa of pharynx, D. None', 'role': 'user'}, {'content': "Answer: C \nExplanation: Pyriform fossa lies between quadrate membrane and medial side of thyroid cailage. It is transversed by internal laryngeal nerve.The pyriform fossa is separated from vallecula by lateral folds of the tongue. Ref: BD Chaurasia's HUMAN ANATOMY, Volume 3.", 'role': 'assistant'}]