This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Gynaecology & Obstetrics
[{'content': "In this normal menstrual cycle graph, the mark 'X' represents levels of which hormone? \nSelect and explain. \nA. LH, B. FSH, C. Estrogen, D. Progesterone", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Green line: LH surges and peaks before ovulation Blue line: FSH : responsible for follicular development in the early phase of the cycle, increases gradually upto ovulation Red line: Estrogen : increases steadily in follicular phase secondary to follicular development as estrogen is produced by the follicle and is responsible for growth of the endometrium in follicular phase Dotted line (marked X ): Progesterone: stas to rise after ovulation (after formation of corpus luteum), responsible for stabilisation of endometrium. Withdrawl of progesterone leads to endometrial shedding (menstrual bleed)', 'role': 'assistant'}]