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Nigerian Finance Minister Ngozi Okonjo-Iweala speaks during a media briefing in Pretoria in this March 23, 2012 file photo. Okonjo-Iweala, 57, was nominated on March 23 by African power houses Nigeria, South Africa and Angola to lead the poverty-fighting institution when its current president Robert Zoellick steps down in June. To match Interview WORLDBANK-NIGERIA/ REUTERS/Siphiwe Sibeko/Files (SOUTH AFRICA – Tags: BUSINESS POLITICS HEADSHOT)
Nigerian Finance Minister Ngozi Okonjo-Iweala speaks during a media briefing in Pretoria in this March 23, 2012 file photo. Okonjo-Iweala, 57, was nominated on March 23 by African power houses Nigeria, South Africa and Angola to lead the poverty-fighting institution when its current president Robert Zoellick steps down in June. To match Interview WORLDBANK-NIGERIA/ REUTERS/Siphiwe Sibeko/Files (SOUTH AFRICA – Tags: BUSINESS POLITICS HEADSHOT)