What is the primary function of the Food and Drug Administration (FDA)?

The primary function of the Food and Drug Administration (FDA) revolves around ensuring the safety and efficacy of food, drugs, and medical devices for the public. This responsibility is critical for protecting public health. The FDA evaluates new medications and vaccines before they can be sold, ensuring they meet rigorous testing standards for safety and effectiveness. Similarly, it oversees the safety of food products, making sure that they do not pose health risks before they reach consumers. Additionally, the FDA regulates medical devices, ensuring that these products are safe for use and perform as intended.

In contrast, the other options do not accurately represent the FDA's role. The FDA does not directly regulate healthcare providers or their practices, nor does it create healthcare policies for insurance plans or provide direct healthcare services to the public. Its focus is specifically on the regulation of food and drug safety for the protection of public health.