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: Surgery
Which of the following doesn't increase the risk of Ca breast? 
Select and explain. 
A. Nulliparity, B. Multiparity, C. Female sex, D. Women who avoid breast feed
B: Multiparity
Answer: B: Multiparity 
Explanation: Family history of Ca breast in first degree relatives is also a risk factor for Ca breast. Ref: Manipal Manual of Surgery, Page 260.