This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Progesterone is added to estrogens in H to achieve wof effects \nSelect and explain. \nA. Decrease the estrogen action on the breast, B. Decrease the occurrence of endometrial cancers, C. Increase the effectiveness of the estrogens, D. Inhibit bone resorption', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hormone replacement therapy (H) In nonhysterectomised postmenopausal women estrogen therapy is supplemented with a progestin for 10-12 days each month to counteract the risk of inducing endometrial carcinoma. Ref:- kd tripathi; pg num:-318', 'role': 'assistant'}]