The correct option is A Flemming
German zoologist Otto Btschli was one of the first researchers who might have claimed the discovery of the process presently known as "mitosis", a term coined by Walther Flemming in 1882. Mitosis was discovered in frog, rabbit, and cat corneal cells in 1873 and described for the first time by the Polish histologist Wacaw Mayzel in 1875.