Which two organizations jointly established Codex Alimentarius?

The correct answer highlights the collaboration between the World Health Organization (WHO) and the Food and Agriculture Organization (FAO) in establishing the Codex Alimentarius. This collaboration was initiated to develop food standards and guidelines with the aim of protecting consumer health and ensuring fair trade practices in the food sector.

The Codex Alimentarius, also known as the "Food Code," serves as a key reference point for national and international food policy and is vital in facilitating international trade in food. The joint efforts of WHO and FAO leverage their expertise in health and agriculture, respectively, enabling them to address various issues related to food safety, nutrition, and quality effectively.

In contrast, other organizations listed in the options do not share the same foundational role in the creation of Codex Alimentarius as WHO and FAO. For example, while UNICEF does focus on health and nutrition, it wasn't part of the establishment of Codex. Similarly, the USDA primarily pertains to agriculture and food policies in the United States and does not have a direct role in the Codex framework. Lastly, while the Pan American Health Organization has a focus on health in the Americas and works on various policy issues, it is not one of the founding organizations of Codex Alimentarius either.