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
Protein involved in Alzheimer's disease : 
Select and explain. 
A. Apo E gene, B. Presel in - II, C. Amyloid poion, D. All
A: Apo E gene
Answer: A: Apo E gene 
Explanation: A i.e. Apo E gene