Which statement is true?
lipids are a type of fat.
fats are a type of lipid.
fats and lipids are separate and unrelated substances.
all lipids are fats, and all fats are lipids.

The correct answer would be Fats are a type of lipid.

Fats are sub-types of lipids which are generally made up of fatty acid chains and glycerol. Other types of lipids are phospholipids, glycerophospholipids, sphingolipids, sterol lipids et cetera.

Fatty acids are the long aliphatic chains with carboxylic acid at one end. These chains can be saturated as well as unsaturated.

Glycerol is a polyol compound which is odorless and colorless in nature.

Fatty acid chains are attached to the glycerol with the help of ester bonds.

Most common type of glycerides are triglyceride in which three fatty acid chains are attached to the three OH groups of the glycerol (three chains per molecule).

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