This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
[{'content': 'Sleep waves in the hippocampal area are - \nSelect and explain. \nA. Delta, B. Theta, C. Beta, D. Alpha', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Alpha rhythm → Parietal and occipital lobe.\nBeta rhythm→ Frontal lobe\nTheta rhythm\xa0 → Hippocampus (in non-human mammals), cortex (in human).', 'role': 'assistant'}]