This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': 'Pyriform sinus is laterally bounded by what? \nSelect and explain. \nA. Interarytenoid aery, B. Thyroid aery, C. Epiglottis, D. Thyrohyoid membrane', 'role': 'user'}, {'content': "Answer: D \nExplanation: On either side of the laryngeal orifice in humans is a recess, termed the piriform sinus (also piriformrecess, pyriform sinus, piriform fossa, or smuggler's fossa), which is bounded medially by the aryepiglottic fold, laterally by the thyroid cailage and thyrohyoid membrane. The fossae are involved in speech.", 'role': 'assistant'}]