When we begin to complain, we disable the part of our brain that is responsible for
Happiness
Creativeness
Problem solving
Positivity

Damage to the hippocampus is scary, especially when you consider that it's one of the primary brain areas destroyed by Alzheimer's. While it's not an exaggeration to say that complaining leads to brain damage, it doesn't stop there. When you complain, your body releases the stress hormone cortisol.

Explanation:

since you have not provided the options here i   am going to give you general overview about hormone.hormone are actually the part of endocrine system in our body and produced by the endocrine glands. the hormones act like a chemical messenger   within human body. once produce by the glands they   travel through the blood stream and reach at specific or target tissue and organs   which result in control of our body function. the hormones are specific in their work and work on only the targeted tissue or organ   . with the of hormone endocrine system regulate the heart rate , metabolism, our mood and   growth as well as the development and even the sleeping cycle etc. they actually are the messenger for body cell and organs .