This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraceptives, Subject name: Gynaecology & Obstetrics
[{'content': 'Centchroman is : \nSelect and explain. \nA. New drug for fibroids, B. New drug for endometriosis, C. Injectable contraception, D. Nonsteroidal oral contraception', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Centchroman/ Ormeloxifene Nonsteroidal estrogen antagonist : SERM (Selective estrogen receptor modulator) Developed at CDRI, Lucknow. Tablets of 30 mg to be taken twice a week for 3 months and then once a week for contraception . Has a weak Estrogenic and potent antiestrogenic effect--acting mostly on the endometrial target organs to suppress proliferation of the endometrium, thereby interfering with nidation of the embryo; Causes asynchrony between the Ovulation and the endometrial development Other uses: Breast cancer, benign breast diseases, abnormal uterine bleeding', 'role': 'assistant'}]