This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain , Subject name: Anatomy
[{'content': 'Most commonly lesioned nerve in intracranial aneurysms is \nSelect and explain. \nA. Optic, B. Oculomotor, C. Trochlear, D. Abducent', 'role': 'user'}, {'content': "Answer: B \nExplanation: Intracranial aneurysm may involve oculomotor, abducent and optic nerve in descending order Trochlear nerve is involvement is higher in head trauma. Ref: Gray's 39e/p-227", 'role': 'assistant'}]