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: Ophthalmology
[{'content': "Wernicke's heminopic pupillary reaction indicates lesions at the level of: \nSelect and explain. \nA. Optic tract, B. Distal pa of optic nerve, C. Optic chiasma, D. Optic radiations", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Optic tract', 'role': 'assistant'}]