What is the relationship between Carlos Lopes and United Nations 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.

New York, Usa - — The Chairperson of the African Union Commission (AUC) Dr. Nkosazana Dlamini Zuma and the Executive Secretary of the United Nations Economic Commission for Africa (UNECA) Dr. Carlos Lopes will officially welcome the new President of the African Development Bank (AfDB), Dr. Adesina Akinwumi, to Addis Ababa, Ethiopia, headquarters of both the AUC and the UNECA.

Answer: employer