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': 'Which of the following cranial nerves are present in the posterior fossa? \nSelect and explain. \nA. 3rd to 12th, B. 4th to 12th, C. 5th to 12th, D. 6th to 12th', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The posterior fossa, or infratentorial compament, is formed by the occipital bone, the dorsum sellae and clivus of the sphenoid bone, and poions of the temporal and parietal bones. It contains the cerebellum, pons, medulla, and pa of the midbrain. It is separated from the middle cranial fossa in and near the midline by the dorsum sellae of the sphenoid bone and on either side by the superior angle of the petrous poion of the temporal bone (petrous pyramid). Lesions in the posterior fossa may affect cranial nerves III to XII.', 'role': 'assistant'}]