A. Alexander Fleming 
B. Louis Pasteur
C. Michal Faraday
D. John Loannids

Submitted by: Aurangzeb Bhutto

Alexander Fleming, a Scottish bacteriologist, is credited with the discovery of the first antibiotic medicine, penicillin, in 1928. While working at St. Mary’s Hospital in London, Fleming observed that a mold called Penicillium notatum inhibited the growth of bacteria in a petri dish. This chance observation led to the development of penicillin, which revolutionized medicine by effectively treating bacterial infections.

Louis Pasteur, a French microbiologist, is renowned for his contributions to the understanding of microbial fermentation and the development of vaccines, but he did not invent antibiotic medicine. Michal Faraday, an English scientist, made significant contributions to the fields of electromagnetism and electrochemistry, but he was not involved in the invention of antibiotics. John Ioannidis is a contemporary physician-scientist known for his work on evidence-based medicine and research methodology, but he is not associated with the invention of antibiotics.