This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and Reproduction, Subject name: Physiology
[{'content': 'During this phenomenon (arrow mark), changes in hormone levels noted are, \nSelect and explain. \nA. Increased estrogen, increased progesterone, B. Decreased estrogen, increased progesterone, C. Decreased estrogen, decreased progesterone, D. Increased estrogen, decreased progesterone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Increased estrogen, decreased progesterone(Ref: Ganong, 25th ed/p.403)LH surge happen 24 - 36 hrs before ovulationAt that time, there is increased estrogen, decreased progesterone.', 'role': 'assistant'}]