This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
[{'content': 'All are the risk factors for endometrial carcinoma except : \nSelect and explain. \nA. Multiparity, B. Obesity, C. Early menarche, D. Unopposed estrogen therapy', 'role': 'user'}, {'content': "Answer: A \nExplanation: Pathology behind endometrial cancer is unopposed estrogen exposure to endometrium Multiparity is a protective factor Unopposed oestrogen or high level of oestrogen Chronic anovulation, PCOD Familial predisposition Tamoxifen Obesity, hypeension, diabetes Feminizing ovarian tumour Low parity Late menopause Reference: Shaw's Textbook of Gynaecology 16th edition page no 508", 'role': 'assistant'}]