Which of the following United Nations organisation has been awarded the Nobel Prize twice?

The United Nations High Commissioner for Refugees (UNHCR) has been awarded the Nobel Peace Prize twice – in 1954 for its pioneering work in aiding European refugees after World War II, and again in 1981 for its assistance to refugees worldwide. The other organisations have received the Nobel Peace Prize only once each (IPCC in 2007, IAEA in 2005, UNICEF in 1965).