Nigeria's Agriculture Minister Akinwumi Adesina (L), new president of the African Development Bank (AfDB), speaks beside his predecessor Donald Kaberuka during the closing ceremony of the annual meeting commemorating the 50th anniversary of the AfDB in Abidjan May 29, 2015. Adesina won an election on Thursday to become the new president of AfDB, a post that will see him guide the institution through Africa's increasingly complex financial environment. REUTERS/Luc Gnago