Best Undergrad Major for MPH?

I am very interested in a career in public health (specifically program planning and management at the WHO). What undergrad major is best for applying to grad school?

Potential majors (listed by order of highest to lowest interest):
-International Studies (concentration in global relations or global development and sustainability)
-International Relations
-Political Science
-Business

This is the ideal masters degree I would like to have;
http://publichealth.gwu.edu/programs/global-health-program-design-monitoring-and-evaluation-mph

Thanks!

You can major in any of those things and go into public health - but social science and natural science majors are probably the best preparation, since public health rests primarily on those disciplines. International studies, international relations and political science are all equally good for what you want to do.