State the main functions of World Health Organization.

The WHO:

I. Promotes and supports projects for research on diseases that are prevailing in the area.

II. Collects and supplies information about the occurrence of diseases of epidemic nature like cholera, plague, yellow fever, etc.

III. Lays the pharmaceuticals standards for important drugs, to ensure purity and size of the dose.

IV. Organizes campaigns for the control of epidemic (widespread) and endemic (local) diseases.