This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pathology
Which one of the following is HLA-associated diabetes mellitus? 
Select and explain. 
A. Type I diabetes mellitus, B. Type II diabetes mellitus, C. Stress related diabetes mellitus, D. Gestational diabetes mellitus
A: Type I diabetes mellitus
Answer: A: Type I diabetes mellitus 
Explanation: Type 1 diabetes mellitus is also called HLA associated diabetes. Type 1 diabetes shows genetic susceptibility. Most impoant locus is the HLA gene cluster on chromosome 6p21,which according to some estimates contributes as much as 50% of the genetic susceptibility to diabetes. (Ref:ROBBINS Text book of pathology)