Question

thickening of the endometrium is controlled by:
lh
fsh
estrogen
progesterone

Explanation:

In the menstrual cycle, estrogen is responsible for the thickening of the endometrium (the uterine lining). LH (Luteinizing Hormone) triggers ovulation, FSH (Follicle - Stimulating Hormone) stimulates follicle development, and progesterone is involved in maintaining the endometrium after ovulation, not the initial thickening. So the hormone that controls the thickening of the endometrium is estrogen.

Answer:

C. Estrogen