**Core Concept**
The question requires knowledge of epidemiological tools used to compare and analyze health statistics across different countries. The correct answer involves understanding the concept of a composite index that combines various health metrics.

**Why the Correct Answer is Right**
The correct answer, **WHO's Health System Performance Assessment (HSPA) framework**, is a comprehensive tool used to compare the health systems of countries. This framework takes into account multiple indicators, such as health outcomes, health system responsiveness, and health system sustainability. It is an essential tool for policymakers and researchers to evaluate and improve health systems globally.

**Why Each Wrong Option is Incorrect**
**Option A:** The Disability-Adjusted Life Years (DALY) is a measure used to quantify the burden of disease, but it does not provide a comprehensive comparison of health systems across countries.

**Option B:** The Human Development Index (HDI) is a composite index that measures health, education, and income, but it does not specifically focus on health system performance.

**Option C:** The Global Health Security Index (GHSI) is a tool used to assess countries' preparedness for health crises, but it is not a comprehensive framework for comparing health systems.

**Clinical Pearl / High-Yield Fact**
When comparing health statistics across countries, it's essential to use a composite index that takes into account multiple indicators, such as health outcomes, health system responsiveness, and health system sustainability.

**Correct Answer:** C. World Health Organization's Health System Performance Assessment (HSPA) framework.