Identify the hormone with its correct matching of source and function:

Explanation

Option C is correct. Melatonin is a hormone produced by the brain's pineal gland that primarily regulates circadian rhythms, the body's 24-hour internal clock, to promote sleep and wake cycles. Beyond sleep, it functions as an antioxidant and anti-inflammatory agent, protecting cells and DNA from damage. Melatonin also supports the immune system and can influence reproductive functions and brain health by protecting against neurodegeneration. Oxytocin is produced by the hypothalamus and generally secreted by the posterior pituitary. It stimulates the secretion of milk from mammary glands; causes contraction of the uterus at the time of childbirth. Progesterone is secreted by the corpus luteum. It stimulates the uterus for pregnancy, implantation, formation of the placenta, and development of the mammary glands. The atrial natriuretic factor is secreted by the atrial wall in response to an increased return of the venous blood. This hormone regulates the blood volume through increased excretion of ions and water.