This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex Hormones, Subject name: Physiology
[{'content': 'Secretory phase of endometrium is due to which hormone? \nSelect and explain. \nA. Estrogen, B. Progesterone, C. Prolactin, D. Pregnenediol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref: Guyton, 12th edition, Page 995 and Essentials of Medical Physiology By Khurana, Page 509Explanation:PHASES OF ENDOMETRIAL CYCLEThe endometrial cycle of 28 days can be divided into three phases:o Menstrual Phase (1-5 days)o Proliferative Phase (6-14 days)o Secretory Phase (15-28 days).(See table on the next page)', 'role': 'assistant'}]