What act provided prescription drug coverage to patients eligible for Medicare?

The Medicare Improvement and Modernization Act of 2003 is the correct choice because it specifically introduced the Medicare Part D program, which provides prescription drug coverage to individuals eligible for Medicare. This act was a significant reform in the Medicare system, as it allowed seniors and disabled individuals who qualify for Medicare to obtain affordable prescription medications through various plans.

The initiative was aimed at addressing the rising costs of prescription drugs and enhancing the overall health care coverage for Medicare beneficiaries. With this act, patients could receive subsidized drug coverage, making medications more accessible and affordable.

Other options do not pertain directly to providing prescription drug coverage to Medicare recipients. The FDA Modernization Act of 2004 focused on streamlining the FDA's ability to review and approve drugs and devices, while the Affordable Care Act of 2010 primarily transformed health care access and insurance coverage but did not directly introduce prescription drug benefits for Medicare. The Drug Enforcement Administration Act is associated with regulating controlled substances rather than expanding Medicare benefits.