Multiple choice

From which of the following species of Penicillium was the drug penicillin obtained by Flemming?

  1. P. notatum

  2. P. roguefoth

  3. P. camemberti

  4. P. chrysogenum

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A Correct answer
Explanation

Alexander Fleming discovered penicillin in 1928 from the mold Penicillium notatum. This species produced the antibiotic compound that inhibited bacterial growth. While industrial production later used P. chrysogenum for higher yields, the original discovery was from P. notatum. P. camemberti is used in cheese production, and P. 'roguefoth' appears to be a misspelling or non-existent species name.