This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'Sleep waves in hippocampal area is(MP 2000, AI 1998, KARNATAKA 2002, ASSAM 2002) \nSelect and explain. \nA. Delta, B. Theta, C. Beta, D. Alpha', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Theta(Ref: Ganong, 25th ed/p.273)Theta wave#Frequency is 4-7Hz#Generated in hippocampus#Most commonly seen in children#Pathologically seen often in degenerative brain diseases', 'role': 'assistant'}]