Final answer:
Section 4205 of the Patient Protection and Affordable Care Act, also known as Obamacare, assigns the responsibility of enforcement to the Food and Drug Administration (FDA).
Step-by-step explanation:
Section 4205 of the Patient Protection and Affordable Care Act (PPACA), often referred to as Obamacare, is part of the comprehensive healthcare reform legislation signed into law by President Obama in 2010. Among various provisions aimed at expanding access to health insurance, section 4205 specifically deals with nutrition labeling of standard menu items at chain restaurants and vending machines, and the responsibility for its enforcement falls to the Food and Drug Administration (FDA). This section aims to provide consumers with more nutritional information to make informed choices about the foods they eat in order to improve public health outcomes.