**Core Concept**
Universal Health Coverage (UHC) is a crucial concept in global health policy, aiming to ensure that all individuals and communities have access to necessary health services without facing financial hardship. This concept emphasizes the importance of equity and accessibility in healthcare systems.

**Why the Correct Answer is Right**
The correct answer reflects the definition of UHC, which is a key principle of the World Health Organization's (WHO) vision for health systems. UHC aims to reduce health inequities and ensure that all individuals have access to essential health services, including preventive, curative, and rehabilitative services. This concept is closely tied to the principles of social determinants of health and the recognition that health is a fundamental human right.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because Universal Access does not necessarily imply that healthcare is universally accepted or acceptable by individuals.
**Option B:** This is incorrect because the term "Health for All" is a phrase used by the WHO, but it is not the exact definition of UHC.
**Option C:** This is incorrect because "Healthcare Equity" is an important principle, but it is not the definition of UHC.

**Clinical Pearl / High-Yield Fact**
A key aspect of UHC is the recognition that healthcare is a fundamental human right, and that individuals should not face financial hardship when accessing essential health services. This concept has significant implications for healthcare policy and planning, particularly in low- and middle-income countries.

**Correct Answer: D. Universal Health Coverage**