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His father Chief Gilbert Chikelu , the Owelle Ichida , worked for Olusegun Obasanjo when he was military head of state .
 Chikelu, Olusegun Obasanjo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chikelu, Olusegun Obasanjo