R-L: President Muhammadu Buhari; Chairman Bill And Melinda Gates Foundation, Mr Bill Gates; President Dangote Group, Alhaji Aliko Dangote; President Global Development of Bill and Melinda Gates Foundation, Mr Christopher J. Elias and Director Africa Team, Global Policy and Amp; Advocacy Of Bill And Melinda Gates Foundation, Mr Ayo Ayaji, during an audience with Bill Gates and Alhaji Aliko Dangote at the State House In Abuja. Photo; Sunday Aghaeze