Penicillin was discovered by:

🧠 Explanation:

Penicillin was discovered by Alexander Fleming in 1928. While working at St. Mary’s Hospital in London, Fleming observed that a mold called Penicillium notatum produced a substance that killed or inhibited the growth of certain bacteria. This discovery marked the beginning of the antibiotic era, revolutionizing medicine by providing an effective treatment against bacterial infections such as pneumonia, strep throat, and scarlet fever. Penicillin’s development paved the way for the mass production of antibiotics, saving millions of lives worldwide. Fleming’s work highlighted the importance of careful observation and experimentation in medical research, earning him a Nobel Prize in Physiology or Medicine in 1945.