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': 'Ocular bobbing? \nSelect and explain. \nA. Midbrain, B. Pons, C. Medulla, D. Coex', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Pons Square-wave erks Not localizing Macro square-wave erks Cerebellum Macrosaccadic oscillation Cerebellum Voluntary nystagmus Volitional Saccadic pulses Cerebellum, lower brainstem Ocular flutter Cerebellum, lower brainstem Opsoclonus Cerebellum, lower brainstem Ocular bobbing Pons", 'role': 'assistant'}]