Which groups of patients are primarily served by Medicare?

Medicare primarily serves a broad range of groups, including the elderly, disabled individuals, and low-income individuals, which makes this choice accurate. Specifically, the program is designed to provide health coverage for people aged 65 and older, regardless of income. Additionally, it covers certain younger individuals who are disabled or who have specific conditions, such as End-Stage Renal Disease (ESRD) or Amyotrophic Lateral Sclerosis (ALS).

This answer reflects the comprehensive nature of Medicare's eligibility criteria, emphasizing that it is not limited to age alone; it also addresses the health needs of those with disabilities or chronic health issues. Therefore, the inclusion of low-income individuals is relevant as they may qualify for additional assistance programs that complement Medicare, such as Medicaid, which can help cover costs that Medicare does not.

The other options lack the full spectrum of groups served by Medicare or misrepresent the population it targets. For instance, focusing solely on elderly patients or veterans does not capture the complete demographic served by Medicare, nor does it acknowledge the complexities regarding disabled individuals who may not be elderly but still qualify for Medicare benefits.