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: Medicine
[{'content': 'Type of wave in Metabolic Encephalopathy - \nSelect and explain. \nA. Alpha, B. Beta, C. Gamma, D. Delta', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]