Multiple choice general knowledge science & technology Who invented Penicillin ? Alexander Fleming(Britain) Paul Ehrlich(Germany) Doisy Dam(U.S.A) Louis Sokoloff(U.S.A) Reveal answer Fill a bubble to check yourself A Correct answer Explanation Alexander Fleming discovered penicillin in 1928 at St. Mary's Hospital in London when he noticed that mold (Penicillium notatum) killed bacteria in a petri dish. This discovery revolutionized medicine and earned him the Nobel Prize.