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': 'Superior wall of middle ear is formed by \nSelect and explain. \nA. Tympanic membrane, B. Jugular bulb, C. Tegmen tympani, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref BDC volume3,sixth edition The relations are: FLOOR-Internal jugular vein ROOF-Tegmen tympani ANTERIOR WALL-Internal carotid aery, canal for tensor tympani, tubal opening POSTERIOR WALL-Facial canal, aditus to antrum MEDIAL WALL-Oval window, round window, pyramid, tympanic plexus, promontory LATERAL WALL-Malleus, incus,chorda tympani nerve, tympanic membrane.', 'role': 'assistant'}]