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 is not a risk factor for breast carcinoma? 
Select and explain. 
A. Saturated fatty acids, B. Early menopause, C. Nulliparous women, D. Oestrogen unopposed by progesterone
B: Early menopause
Answer: B: Early menopause 
Explanation: Causes for breast carcinoma are -

Oestrogen exposure, unopposed by progesterone
Nulliparous women
Mutations in the  BRCA1 and BRCA2 genes 
Early menarche/late menopause 
Family history 
Saturated dietary fats
Previous benign atypical hyperplasia