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': 'Trochlear nerve nucleus lies at the level of \nSelect and explain. \nA. Inferior cerebellar peduncle, B. Inferior colliculus, C. Superior colliculus, D. Superior cerebellar peduncle', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Trochlear nerve nucleus is located in anterior part of gray matter that surrounds cerebral aqueduct, at the level of inferior colliculus.', 'role': 'assistant'}]