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A Medicare Advantage (MA) plan is specifically defined as a health plan option that is provided by private insurance companies that have received approval from Medicare. These plans are an alternative to Original Medicare (Part A and Part B) and may include additional benefits not covered by traditional Medicare, such as vision, dental, and wellness programs.

Private insurers design these plans to deliver Medicare benefits while potentially incorporating additional services to enhance members' overall health coverage. The approval by Medicare ensures that these private plans meet specific federal guidelines and standards for coverage and quality, which distinguishes Medicare Advantage plans from other insurance options.

The other choices do not accurately capture the essence of what defines an MA plan. While government involvement exists in terms of oversight and certification, Medicare Advantage plans are not direct government insurance. They may cover a range of services beyond hospital care, contradicting the notion that they are limited to just hospital services. Furthermore, all MA plans must be approved by Medicare, which negates the idea that they consist of plans not recognized by the program. Therefore, option C provides the most accurate and comprehensive definition of a Medicare Advantage plan.