The____, _, defines wellness as a state of complete physical, mental, and social well-being, and not merely the absence of disease or infirmity.

O a. CDC
O b. wHO
O c. USDA
O d. FDA

b. WHO (World Health Organization)

b. WHO

The correct answer is option b. WHO (World Health Organization).

The World Health Organization defines wellness as a state of complete physical, mental, and social well-being, and not merely the absence of disease or infirmity.

To arrive at this answer, you can follow the following steps:

1. Read through the given options: CDC, WHO, USDA, and FDA.

2. Understand what each acronym stands for: CDC (Centers for Disease Control and Prevention), WHO (World Health Organization), USDA (United States Department of Agriculture), FDA (Food and Drug Administration).

3. Compare the descriptions of each organization with the definition of wellness provided in the question.

4. The Centers for Disease Control and Prevention (CDC) primarily focuses on disease prevention and control, and while they promote public health, they do not define wellness comprehensively or specifically as stated in the question.

5. The United States Department of Agriculture (USDA) is responsible for policies related to agriculture, food, and nutrition, and while they may address aspects of wellness, they do not exclusively define it.

6. The Food and Drug Administration (FDA) is responsible for ensuring the safety and effectiveness of various products, including medications and food, but their scope does not encompass a comprehensive definition of wellness.

7. The World Health Organization (WHO) is an international organization that works towards public health on a global level. They focus on a broad range of health-related topics and have defined wellness as a state of complete physical, mental, and social well-being, which aligns with the description given in the question.

Therefore, based on this analysis, the correct answer is option b. WHO.