Estrogen and progesterone are primarily secreted by:

Estrogen and progesterone are the primary female sex hormones responsible for the development of secondary sexual characteristics and the regulation of the menstrual cycle. ### Step 1: Identify the hormone type Estrogen and progesterone are steroid hormones produced within the female reproductive system. ### Step 2: Analyze the endocrine hierarchy While the **Hypothalamus** and **Pituitary gland** control the reproductive cycle by secreting $GnRH$ (Gonadotropin-Releasing Hormone) and $FSH/LH$ (Follicle Stimulating Hormone / Luteinizing Hormone), they do not produce the steroid hormones themselves. ### Step 3: Identify the primary secretion site In females, the **Ovaries** contain follicles that produce estrogen and the corpus luteum which produces progesterone. While the adrenal glands produce trace amounts, the ovaries are the *primary* source. Therefore, the correct option is **D: Ovary**.