The regulates tobacco, dietary supplements, vaccines, veterinary drugs, medical devices, cosmetics, products that give off radiation, and biological products.

The Food and Drug Administration

Explanation:

The Food and Drug Administration was established on 30 June 1906, following the passage of the first major food and drug safety bill known as the “1906 Pure Food and Drug Act”. This was established in order to get the government to regulate food. The FDA is a federal agency under the United States Department of Health and Human Services. The FDA is headed by a commissioner, who is appointed by the President, with four directorates of the agency which are Foods and Veterinary Medicine, Medical Products and Tobacco, Global Regulatory Operations and Policy, and Operations.

i would say d

explanation:

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme