What is the relationship between Sierra Leone and World Health Organization in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

The World Health Organization said on Monday that a further $696 million in donor funding is needed to rebuild health services in Guinea, Sierra Leone and Liberia over the next two years.

Answer: member_of