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: Physiology
[{'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: Sleep waves and brain areas\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Alpha rhythm- Parietal and occipital lobe\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Beta rhythm- Frontal lobe\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Theta rhythm- Hippocampus (Mammals other than human), Cortex (Human)', 'role': 'assistant'}]