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
BRCA-1 gene is located at chromosome location? 
Select and explain. 
A. 17 p21, B. 17 q21, C. 13 p21, D. 13 q21
B: 17 q21
Answer: B: 17 q21 
Explanation: Ans. is 'b' i.e., 17 q21