The correct option is D Adrenaline
Adrenaline, also known as epinephrine, is a hormone and medication. Adrenaline is normally produced both by the adrenal glands and by a small number of neurons in the medulla oblongata, where it acts as a neurotransmitter involved in regulating visceral functions.
Adrenaline (also called epinephrine) is a hormone your body makes in moments of crisis. It makes the heart beat faster and work harder, increases the flow of blood to the muscles, makes you more alert, and causes other changes to prepare the body to meet an emergency. It is also a chemical messenger in the brain.
Calcitonin decreases blood calcium levels, melatonin regulates circadian rhythm and prolactin helps in milk production after childbirth.
So, the correct answer is option 'd'.