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': 'BRCA-1 gene is located at chromosome location? \nSelect and explain. \nA. 17 p21, B. 17 q21, C. 13 p21, D. 13 q21', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 17 q21", 'role': 'assistant'}]