The correct answer is B. Brain.
The pineal gland is a small, pea-sized gland in the brain that produces melatonin, a hormone that helps regulate sleep and wakefulness. It is located in the epithalamus, near the center of the brain.
The liver is the largest organ in the body and is located in the upper right abdomen. It is responsible for many important functions, including metabolism, detoxification, and blood clotting.
The kidneys are two bean-shaped organs located in the lower back. They are responsible for filtering waste products from the blood and producing urine.
The uterus is a muscular organ in the female reproductive system. It is where a fertilized egg implants and develops into a fetus.
The pineal gland is not located in any of the other options.