Question

which hormone exerts negative feedback on gnrh during the luteal phase?
estrogen
progesterone
fsh
lh

Explanation:

During the luteal phase, progesterone levels rise and exert negative - feedback on the hypothalamus to decrease the secretion of gonadotropin - releasing hormone (GnRH). Estrogen can have both positive and negative feedback effects at different times but during the luteal phase, it's progesterone's negative - feedback on GnRH that is prominent. FSH (follicle - stimulating hormone) and LH (luteinizing hormone) are gonadotropins regulated by GnRH, not regulators of GnRH during the luteal phase in the context of this question.

Answer:

B. Progesterone