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2 points

A female, on hormonal contraceptives, missed her period but tested negative for pregnancy. Which of the following describes the changes during her follicular phase?

A. High concentration of estrogen stimulated the hypothalamus to release GnRH.
B. Constant low levels of estrogen inhibit LH secretion, preventing ovulation.
C. Synthetic estradiol caused thickening of the endometrial lining.
D. High concentration of estrogen stimulated the pituitary gland to release LH and FSH.