This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Which of the following structures is not at immediate risk of erosion by cholesteatoma? \nSelect and explain. \nA. Long process of incus, B. Fallopian canal containing facial nerve, C. Horizontal semicircular canal, D. Basal plate of stapes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cholesteatoma has the propey to destroy the bone by viue of the enzymes released by it.Structures immediately at the risk of erosion are:-The long process of the incusFallopian canal containing facial nerveHorizontal/lateral semicircular canalRef: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 73 - 74', 'role': 'assistant'}]