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You have a friend who lost 7 kg (about 15 pounds) of fat on a regimen of strict diet and exercise.
How did the fat leave his body?

A. It was broken down to amino acids and eliminated from the body.
B. It was converted to ATP, which weighs much less than fat.
C. It was released as CO2 and H20.
D. It was converted to urine and eliminated from the body.
E. It was converted to iron and then released.