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The first natural antibiotic, discovered by Alexander Fleming, was:

APepsinogen
BPrednisone
CParacetamol
DPenicillin
Answer & Solution
Correct answer: D. Penicillin
1. A mould contaminated his staphylococcus plates. 2. The substance it made killed the bacteria. 3. That substance was penicillin. _Source: OpenStax Microbiology, Chapter 14, Antimicrobial Drugs._
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