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: Anatomy
[{'content': 'Bone not present at bih- \nSelect and explain. \nA. Malleus, B. Incus, C. Stapes, D. Petrous temporal', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Petrous temporal', 'role': 'assistant'}]