This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Physiology & Histology, Subject name: Gynaecology & Obstetrics
[{'content': 'Secretory phase of endometrium is due to: \nSelect and explain. \nA. Estrogen, B. Progesterone, C. Prolactin, D. Pregnanediol', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is b, i.e. ProgesteroneREMEMBERAll the effects on endometrium are due to estrogen and progesterone, not due to their urinary metabolites.So secretory endometrium is due to progesterone and don't confuse your concepts just because pregnanediol is given in the options.", 'role': 'assistant'}]