Section A: Choose the correct answer for the given question from the options.
Assertion (A): The inner walls of the small intestine have finger like projections called villi which are rich in blood.
Reason (R): These villi have a large surface area to help the small intestine in completing the digestion of food.
Reason (R): These villi have a large surface area to help the small intestine in completing the digestion of food.