What does WHO stand for?

The correct choice is World Health Organization. This organization is a specialized agency of the United Nations responsible for international public health. Established in 1948, the WHO focuses on issues such as health systems strengthening, disease prevention, vaccination, and health emergency responses on a global scale. The organization's mission is to ensure that all people can live healthy lives, and it plays a crucial role in coordinating efforts to combat health crises, such as epidemics and pandemics.

Other options, while similar in wording, do not accurately reflect the official title or function of the organization. For instance, World Health Office and World Health Outreach do not exist as recognized entities, and World Humanitarian Organization refers to a different focus, emphasizing humanitarian aid rather than specifically health-related initiatives.