The correct options is (D)
2AgCl + Ca(NO3)2
Halo, any of a wide range of atmospheric optical phenomena
The hormone described above is the hormone Melatonin.
Melatonin is a hormone secreted by the pineal gland in the brain, which helps regulate other hormones and maintains the body's circadian rhythm. This rhythm is an internal 24 hour clock that plays a critical role when we fall asleep and when awake. When it is dark the body releases more melatonin.
It's a pyramid of numbers, I believe.
