Unsaturated fats are made saturated by
A. Polymerisation
B. Hydrogenation
C. Dehydrogenation
D. Hybridisation

Hint: Fatty acids are organic acids which have hydrocarbon chains that end in a -COOH group attached to R- Group.

Complete Answer:
- Unsaturated fats are called beneficial fats beneficial fats are good for our body. They are liquid at room temperature. Unsaturated fats improve blood cholesterol level, stabilize heart rhythms and play many more roles which are beneficial to health. Plants are the main source of unsaturated fatty acids.
- All types of food have specific types of fats. Animal food is the main source of saturated fat. Saturated fatty acids do not possess double or triple bonds between 2 carbon atoms.
- In the process of hydrogenation nickel, palladium or platinum are involved. Because of the addition of hydrogen bonds fatty acids are reduced due to these unsaturated fatty acids converted to saturated fatty acids.

So option b is correct.

Additional information:
Functions of fats-
• They also act as electrical insulators against nerve impulse transmission.
• Cholesterol and phospholipids are important constituents of cell membranes.
• Fats are an important source of fat soluble vitamins.
• Fats stored in adipose tissue serve as a source of energy.
• Phosphatides of blood platelets are involved in blood clotting mechanisms.
• For cellular integrity and permeability cholesterol and phospholipids are required.

Note: Enzymes are complex macromolecules with high molecular weight, effects on the rate of biochemical reactions and not the direction of reaction.