अलेक्झांडर फ्लेमिंग यांनी 1928 साली शोधलेले पहिले प्रतिजैविक खालीलपैकी कोणते होते?

In 1928 Alexander Fleming noticed that the mould Penicillium notatum killed bacteria on a culture plate. The substance it produced, penicillin, was the first true antibiotic; Fleming shared the 1945 Nobel Prize for it.