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': 'All horizontal movements of eye are affected by lesions in the \nSelect and explain. \nA. Cerebellum, B. Midbrain, C. Cerebrum, D. Pons', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The brainstem center controlling the horizontal conjugate eye movements in the neighbourhood of the sixth (abducens nucleus) is the pontine paramedian reticular formation (PPRF).\nThe brainstem center for verticle gaze is in midbrain, just above the third (occulomotor) nuclei.', 'role': 'assistant'}]