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: Psychiatry
Which of the following gene is associated with Alzheimer's disease ? 
Select and explain. 
A. APOE1, B. APOE, C. APOE3, D. APOE4
D: APOE4
Answer: D: APOE4 
Explanation: Alzheimer's disease is caused by mutation in :

APOE4 gene
Presenilin 1 : Chromosome 14
Presenilin 2 : Chromosome 1
APP4 ( Amyloid precursor protein - 4 ) : Chromosome 21