Antonie Philips van Leeuwenhoek FRS was a Dutch businessman and scientist in the Golden Age of Dutch science and technology. A largely self-taught man in science, he is commonly known as "the Father of Microbiology", and one of the first microscopists and microbiologists.
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I believe the answer is option D
If your choices are the following:
a). John Sloan
b). George Washington Plunkitt
c). Thomas Nast
d). William M. Tweed
Then the answer is d). William M. Tweed.
B. Federal Reserve System.