Question

Penicillin was the first antibiotic which was a chance discovery. Alexander Fleming at that time was working on

• A. $Penicilliumnotatum$
• B. $Streptococcibacteria$
  
• C. $Penicilliumpneumoniae$
• D. $Staphylococci$ bacteria

Answer 1

The correct option is D $Staphylococci$ bacteria

Discovery of penicillin

• Penicillin was discovered by Alexander Fleming in 1928 when he noticed that one of his experimental cultures of $Staphylococci$, in unwashed petri dishes, was contaminated with mould.
• The region around the mould was clear without any bacterial colonies.
• He concluded that the chemicals produced by the mould are preventing the growth of bacteria.
• He named the chemical penicillin, after the mould $Penicilliumnotatum.$

Final answer
(D) $Staphylococci$ bacteria