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
All of the following are true of early onsets Alzheimer's disease except - 
Select and explain. 
A. Associated with chromosomal anomalies, B. Profound retardation seen, C. Necrosis of brain neurons seen, D. None
D: None
Answer: D: None 
Explanation: None