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 Complex in man is located on chromosome: \nSelect and explain. \nA. 5, B. 6, C. 7, D. 8', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 6', 'role': 'assistant'}]