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The Brain of the Revolution is "Apolinario Mabini" . why did people called him that? , Because of his role as advisor during the formation of the revolutionary government, and his contributions as statesman thereafter,  a historical monicker he sometimes shares with Emilio Jacinto, who served in a similar capacity for the earlier revolutionary movement, the Katipunan.
Apolinario Mabini is the one who called the "utak ng katipunan".