In 1928, Scottish scientist Alexander Fleming discovered

psychoanalysis.

atomic fission.

penicillin.

the theory of relativity.

In 1928, Scottish scientist Alexander Fleming discovered Penicillin. The correct option among all the options given in the question is the third option. Alexander Fleming was born on 6th of August in the year 1881 and died on 11th of March in the year 1955. He was a Scottish biologist, botanist and pharmacologist. He won the Nobel Prize in physiology in the year 1945.