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
Ocular bobbing? 
Select and explain. 
A. Midbrain, B. Pons, C. Medulla, D. Coex
B: Pons
Answer: B: Pons 
Explanation: 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