This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
[{'content': 'A 67-year-old man develops coma over a few minutes. He is unresponsive on arrival to the hospital. He has ataxic respirations and pinpoint, reactive pupils. Oculocephalic reflexes are absent. There is no motor response with noxious stimulation.For the above patient with altered level of consciousness, select the most likely diagnosis. \nSelect and explain. \nA. basal ganglia hemorrhage, B. cerebellar hemorrhage, C. pontine hemorrhage, D. lobar intracerebral hemorrhage', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pontine hemorrhage is associated with impaired oculocephalic reflexes and small, reactive pupils. It generally evolves over a few minutes, usually with coma and quadriplegia. The prognosis is poor, and death often occurs within hours.', 'role': 'assistant'}]