Final answer:
The CDC is the governmental organization that researches the causes of foodborne-illness outbreaks, working with other agencies to enforce food safety regulations.
Step-by-step explanation:
The governmental organization responsible for researching the causes of foodborne-illness outbreaks is the Center for Disease Control and Prevention (CDC). The CDC, alongside other agencies such as the Food and Drug Administration (FDA) and the United States Department of Agriculture (USDA), plays a crucial role in preventing foodborne disease. These agencies enforce safety regulations in food production, including routine bacteriological testing, to ensure that food for sale is free from pathogens. For example, the CDC was involved in tracing a Salmonella outbreak back to onions and successfully ending the outbreak by recalling the contaminated product.