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': 'Pinpoint pupils are seen in haemorrhage of \nSelect and explain. \nA. Putamen, B. Pons, C. Thalamus, D. Cerebellum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In pontine haemorrhages, deep coma with quadriplegia often occurs over a few minutes. Typically, there is prominent decerebrate rigidity and "pinpoint" (1 mm) pupils that react to light. There is impairment of reflex horizontal eye movements evoked by head turning (doll\'s-head or oculocephalic maneuver) or by irrigation of the ears with ice waterHyperpnea, severe hypeension and hyperhidrosis are commonRef: Harrison 19e pg: 2583', 'role': 'assistant'}]