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: Gynaecology & Obstetrics
Factors that protect against endometrial cancer 
Select and explain. 
A. Obesity, B. Smoking, C. Nulliparity, D. Diabetes
B: Smoking
Answer: B: Smoking 
Explanation: Factors that increase
			endometrial cancer
			risk
Factors that protect
			against endometrial
			cancer


Obesity
Hysterectomy


Diabetes
Combined oral contraceptive pill


Nulliparity
Progestin - based
			Contraceptives, including injectables


Late menopause
			> 52 years
Intrauterine device, including Cu-IUD and LNG-IUS


Unopposed oestrogen
			therapy
Pregnancy


Tamoxifen therapy
Smoking



Family history of
			colorectal and
			endometrial cancer