This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep Disorders, Subject name: Psychiatry
[{'content': 'Pontogeniculo-occipital spike is characteristic of which of the following sleep stage? \nSelect and explain. \nA. Stage 1 NREM, B. Stage 2 NREM, C. Stage 3 NREM, D. REM', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ponto - geniculo - occipital spikes are large phasic potentials, seen in REM sleep. These orginate from cholinergic neurons in pons and pass rapidly to lateral geniculate body and then to occipital coex.', 'role': 'assistant'}]