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': 'Promontory seen in the middle ear is- \nSelect and explain. \nA. Jugular bulge, B. Basal turn of cochlea, C. Semicircular canal, D. Head of incus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Promontory is seen in the medial wall of middle ear and is due to basal coil of cochlea.', 'role': 'assistant'}]