The certificate scandal which erupted in July, however, did not go away with the Minister saying she resigned after finding out her NYSC exemption certificate was fake.
It is, however, not clear when Adeosun submitted her resignation letter.
But a day after she stepped down, Adeosun, who was born and raised in England, departed the country with no news from the Nigerian authorities on the possibility of her prosecution.
Also, she contributed to the floating of several multibillion-dollar Eurobond offerings and led Nigeria's discussions with multilateral institutions.
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Ms Adeosun was appointed as finance minister by President Muhammadu Buhari in 2015.
"The PDP, therefore, demands an immediate open inquest into the records of the Finance Ministry under Mrs. Adeosun, to unravel all improprieties by the Buhari Presidency cabal, including alleged diversion of oil proceeds, fraudulent oil subsidy deals, leading to high fuel price; depletion of our foreign reserves, embezzling of funds returned by Switzerland and other huge sleazes in the ministry", he added.
"This has come as a shock to me and I believe that in line with this administration's focus on integrity, I must do the honourable thing and resign", she said. Her main policy was a bid to improve tax collection and crack down on mismanagement by government agencies.
She has since been replaced by Zainab Ahmed, who until Friday was a junior minister in the Ministry of Budget and National Planning.
"Is it not clear to all that the Buhari administration's so-called anti-corruption war and purported integrity are mere orchestrations to hoodwink Nigerians and the worldwide community, while Mr. President oversees the most corrupt administration in the history of our nation?"