This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endometrial Carcinoma, Subject name: Gynaecology & Obstetrics
[{'content': 'All are risk factors for endometrial carcinoma except:- \nSelect and explain. \nA. Smoking, B. Nulliparity, C. Infeility, D. Tamoxifen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Some of the predisposing factors for Ca endometrium are: Nulliparity Late menopause Obesity & overweight Diabetes mellitus Unopposed estrogen therapy Tamoxifen therapy Atypical endometrial hyperplasia Lynch II syndrome In Gynecological cancers, smoking is predisposing for Ca cervix & CA Vulva of the basaloid type in younger women.', 'role': 'assistant'}]