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
The gene for Breast Cancer (BRCA) is present on chromosome: 
Select and explain. 
A. 21, B. 17, C. 15, D. 9
B: 17
Answer: B: 17 
Explanation: Women with hereditary breast-ovarian cancer susceptibility have mutation in tumor suppressor BRCA genes—

BRCA-1 (located on chromosome 17q) 
BRCA-2 (located on chromosome 13q)

The risk in BRCA-1 carriers is higher compared to that in BRCA-2 carriers.
Mohan H. Textbook of pathology. Jaypee Brothers Medical Publishers; 2015. Edition 7. Page 731