Dairy products are some of the most concentrated, convenient, and accepted sources of calcium for eat-and-runners. Correct answer:A Calcium is a mineral that the body needs for numerous functions. Some of the functions are building and maintaining bones and teeth, blood clotting, the transmission of nerve impulses, and the regulation of the heart’s rhythm. Good food sources of calcium are dairy products. Dairy products have the highest concentration per serving of highly absorbable calcium.