IRS is an acronym for "Federal Agency Responsible" which is responsible administering and enforcing federal tax
IRA is an acronym for "Individual Retirement Account" which is a form of "individual retirement plan", and is a savings account with large tax
FDA is an acronym for Food and Drug Administration. The FDA is a federal agency of the United States Department of Health and Human Services. The FDA is responsible for protecting and promoting public health through the supervision of food safety, tobacco products, medications, vaccines, medical devices, cosmetics, animal foods, veterinary products, etc.