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': "In Alzheimer's disease which area of brain in involved- \nSelect and explain. \nA. Cerebral cortex, B. Hippocampus, C. Cerebellum, D. A + B", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]