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: Pathology
[{'content': 'HLA is present on chromosome: \nSelect and explain. \nA. Sho arm chromosome 6, B. Long arm chromosome 6, C. Sho arm chromosome 3, D. Long arm chromosome 3', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sho arm chromosome 6', 'role': 'assistant'}]