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: Microbiology
HLA complex is on chromosome? 
Select and explain. 
A. 6, B. 7, C. 8, D. 9
A: 6
Answer: A: 6 
Explanation: Ans. is 'a' i.e., 6 HLA complex of genes is located on the sho arm of chromosome 6.