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': "All of the following are true of early onsets Alzheimer's disease except - \nSelect and explain. \nA. Associated with chromosomal anomalies, B. Profound retardation seen, C. Necrosis of brain neurons seen, D. None", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]