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
Presenilin - 1 gene is present on : 
Select and explain. 
A. Chromosome 1, B. Chromosome 2, C. Chromosome 14, D. Chromosome 21
C: Chromosome 14
Answer: C: Chromosome 14 
Explanation: Presenilin - 1 is present on Chromosome 14 & Presenilin - 2  is present on Chromosome - 1. Both are associated with Alzheimer's disease.