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
Ocular bobbing- 
Select and explain. 
A. Midbrain, B. Pons, C. Medulla, D. Coex
B: Pons
Answer: B: Pons 
Explanation: Ocular bobbing centre is pons. Characterised by conjugate eye movements, beginning with a fast downward movement followed by slow drift back to midline. Causes: comatose patient with massive pontine lesion Metabolic encephalopathy.