Insulin Is Needed to Regulate Sugar Levels in the Blood

Insulin is needed to regulate sugar levels in the blood. While every cell in the body contains genes for the production of insulin, it is only produced by a specialized subset of cells in the pancreas. Therefore:

A) every cell must regulate its own sugar production.
B) the genes for insulin production must be mutated except in the specialized cells of the pancreas.
C) there must be mechanisms of gene regulation that promote insulin expression in the specialized pancreatic cells and prevent insulin expression in all other cells.
D) only the specialized cells of the pancreas have functional genes for insulin production.
E) insulin production is not regulated because the genes for it are present in every cell.