Which of the following is the primary sex organ in females?

Ovary

The correct answer is Option (3) - Ovary

The primary sex organ in females is: Ovary

The ovaries are the primary reproductive organs in females. They are responsible for producing ova (eggs) and female sex hormones, including estrogen and progesterone. Ovaries are paired organs located on each side of the pelvis, near the lateral wall of the pelvic cavity. During the menstrual cycle, eggs are released from the ovaries in a process called ovulation, and if fertilization occurs, the ovaries also produce hormones to support pregnancy.