This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep disorders and eating disorders, Subject name: Psychiatry
[{'content': 'Ponto Geniculo Occipital spike is characteristic of ------- sleep \nSelect and explain. \nA. Stage 1 NREM, B. Stage 2 NREM, C. Stage 4 NREM, D. REM', 'role': 'user'}, {'content': 'Answer: D \nExplanation: PGO waves are prominent phasic bioelectrical , closely related to rapid eye , that occur in or during Ref: Principles and practice of sleep medicine, 6e, 2017.', 'role': 'assistant'}]