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Nigeria is Africa's number one producer of oil and has the 2nd largest oil reserves. The fall in the worldwide price in oil has led to a fall in income in recent years. Could the shortfall be solved by the country turning to the production of Yam instead? Dr Francis Jegede is a Senior Lecturer in International Relations at the University of Derby and speaks to Â鶹Éç presenter Devon Daley about whether a switch to this product could work for one of Africa's richest nations