This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuro-ophthalmology, Subject name: Ophthalmology
[{'content': 'The afferent pathway for light pupillary reflex is - \nSelect and explain. \nA. Trigeminal nerve, B. Optic nerve, C. Abducent nerve, D. Ciliary nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Afferent fibres travel along optic nerve to optic chiasma where fibres from nasal retina decussate and travel along the opposite optic tract to terminate in the contralateral pretectal nucleus, while the fibres from the temporal retina remain uncrossed and travel along the optic tract of same side to terminate in the ipsilateral pretectal nucleus refer comprehensive ophthalmology (6 th edition) A K Khurana', 'role': 'assistant'}]