What type of Medicare program requires beneficiaries to opt out specifically?

Medicare Part B is the correct answer because it involves a voluntary enrollment process that requires beneficiaries to actively opt in to receive benefits. Unlike Medicare Part A, which provides hospital insurance and is typically premium-free for those who have paid Medicare taxes for a sufficient amount of time, Part B has a monthly premium that beneficiaries must pay to maintain coverage. This creates a decision point where individuals can choose whether or not to enroll based on their healthcare needs and financial situation.

The option of Medicare Part C, also known as Medicare Advantage, consolidates coverage under a private insurance plan and generally does not require a separate opt-out as it operates within the framework of Parts A and B. Medicare Part A is primarily focused on hospital insurance and is automatic for most beneficiaries, while Medicare Part D, which covers prescription drugs, also requires action from the beneficiaries and is often compared similarly to Part B with regard to enrollment. However, Part B stands out because of its specific requirement for beneficiaries to opt in voluntarily, along with the associated costs.