The and are the glands that stimulate reproductive cycles. A.testes . . . thyroidB. testes . . . ovariesC. ovaries . . . thyroidD. ovaries . . . thymus

The correct answer is: B.

Explanation:

Testes are a pair of organs those are required for the purpose of reproduction in males. They remain descended within a sac like structure called the Scrotum outside the body of the male.They are responsible for producing sperms (male gametes) by the process of Spermatogenesis.Spermatogenesis occurs inside the  seminiferous tubules located in the testes.The testes also contain some specialized interstitial cells called the Leydig cells which are responsible for synthesizing the male sex hormone called Testosterone.This hormone is required for secondary sexual character development in males and for sperm production.Ovaries are a pair of organs those are required for the purpose of reproduction in females. They remain attached to the uterus by a pair of Fallopian tubes.The uterus is the location in the female body where the zygote formed after fertilization of the egg (female gamete) and sperm (male gamete) develop into the embryo and fetus sequentially.They are responsible for producing ova or egg (female gametes) by the process of Oogenesis.Oogenesis happens in the external layers of the ovary.The ovaries possess some specialized interstitial cells called the Granulosa Cells and Theca cells.The Granulosa cells are responsible for synthesizing the hormone, Estrogen.The Theca cells, after ovulation, develops into theca lutein cells which are responsible for synthesizing the hormone, Progesterone.Both the hormones are necessary for the development of secondary sexual characteristics in female and also for the production of ova and the entire process of fetal development.