This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Pathology
Risk factor for endometrial carcinoma is 
Select and explain. 
A. Smoking, B. Obesity, C. Infeility, D. Tamoxifen
B: Obesity
Answer: B: Obesity 
Explanation: Risk factors for this type of carcinomainclude (1) obesity, (2) diabetes, (3) hypeension (4) infeility, (5) exposure to unopposed estrogen Many of these risk factors result in increased estrogenic stimulation of the endometrium and are associated with endometrial hyperplasia. ref : Robbins Basic Pathology, 9E,page-692