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': "Alzheimer's disease, which is involved ? \nSelect and explain. \nA. Frontal cortex, B. Cortical atrophy of temporoparietal cortex, C. Frontal and parietal cortex, D. Occipital cortex", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]