This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Immunity, Subject name: Pathology
HLA antigen is located at? 
Select and explain. 
A. Short arm of chr-6, B. Long arm of chr-6, C. Short arm of chr-8, D. Long arm of chr-8
A: Short arm of chr-6
Answer: A: Short arm of chr-6 
Explanation: Ans. is 'a' i.e., Short arm of chr-6 o HLA complex (MHC) gene is located on the short arm of chromosome 6.