Question

what hormone causes the endometrial lining to thicken?
testosterone
lh
fsh
estrogen

Explanation:

Estrogen stimulates the growth and thickening of the endometrial lining in the uterus during the menstrual cycle in preparation for potential embryo implantation. Testosterone is a male - dominant sex hormone. LH (luteinizing hormone) and FSH (follicle - stimulating hormone) regulate the menstrual cycle but do not directly cause endometrial thickening like estrogen.

Answer:

Estrogen