Answer:
Glycerol!
Step-by-step explanation:
Triglyceride is an Ester, that is formed by the reaction between 1 glycerol and 3 fatty acid molecules, it's commonly known as fat. It act as storage for energy in the human body and as well as provides insulation. It also absorbs fat - absorbing vitamins in the body. When body needs more energy , it breaks down fat by the process of lipolysis into fatty acids and glycerol and release them in the blood.