Which hormone is the primary female sex hormone?

• A. Progesterone
• B. Oxytocin
• C. Testosterone
• D. Estrogen

Answer: (D)

Estrogen is the primary female sex hormone. It drives the development of female secondary sexual characteristics and helps regulate the menstrual cycle by promoting the growth of the uterine lining. It’s mainly produced by the ovaries. While progesterone supports pregnancy and cycle regulation, and oxytocin is involved in bonding and uterine contractions, and testosterone is the main male hormone (though present in smaller amounts in women), estrogen best fits the role of the primary female sex hormone.