Fact 1: If food is not immediately used by the body for energy then that food will be stored for future use. Fact 2: Body fat is stored energy. Given the two facts above, what not digested is used as energy storage?

a). RNA;
b). Urea;
c). fat;
d). glucose;
e). carbohydrates;
f). food;
g). protein;
h). DDT;
Answer:
c).