Question: Usman Mu'azu was the governor of Kaduna State during the reign of the military leader who became President of Nigeria in what year?
Sentence (from "Muhammadu Buhari"): He is a retired major general in the Nigerian Army and previously served as the nation's head of state from 31 December 1983 to 27 August 1985, after taking power in a military "coup d'état".
Relevant evidence: No