Answer : 2. "steroid"
Explanation :

Answer: B) steroid Explanation: Estrogen is a group of steroid hormone that control the development and maintenance of an individuals feminine characteristics. Natural estrogen exists in men as well as women and are found in higher amounts in women Especially in those of reproductive age.   Estrogens are hormones which are responsible to the body functions of the female body system such as menstruation, development of the female body such as pubic hair, breasts and development of the proportions of the body.   Lipids act as best energy storage molecules as the cleavage of fatty acids produces both energy and metabolic water which is a main component in almost all lipids.