What option of Medicare is known as supplemental medical insurance coverage? A)Medicare Part C

B)Medicare Part A
C)Medicare Part D
D)Medicare Part B

The option of Medicare that is known as supplemental medical insurance coverage is Medicare Part B.

To arrive at this answer, one needs to have a basic understanding of the different parts of Medicare:

- Medicare Part A covers hospital insurance and is generally considered as the "base" coverage.
- Medicare Part B covers medical insurance, including doctor's visits, outpatient care, and preventive services.
- Medicare Part C, also known as Medicare Advantage, is an alternative to Parts A and B. It combines hospital and medical insurance and may include additional benefits such as prescription drug coverage, dental, vision, and hearing services.
- Medicare Part D provides prescription drug coverage, which is often referred to as a stand-alone prescription drug plan (PDP).

Given that the question is asking about supplemental medical insurance coverage, it is clear that the correct answer is Medicare Part B. This part of Medicare covers medical services and expenses that are not covered by Part A, such as doctor's visits, lab tests, and durable medical equipment. Part B is optional, but many people choose to enroll in it to have additional coverage for their medical needs.