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(D) Alexander Fleming discovered penicillin,but its full potential as an effective antibiotic was established by Ernest Chain and Howard Florey. They

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(D) Alexander Fleming discovered penicillin,but its full potential as an effective antibiotic was established by Ernest Chain and Howard Florey. They were responsible for the commercial extraction and purification of penicillin,for which all three were awarded the Nobel Prize in $1945$. Therefore,both Ernest Chain and Howard Florey were involved in its commercial extraction.

$I$. Citric acid	$A$. Lactobacillus
$II$. Acetic acid	$B$. Acetobacter aceti
$III$. Butyric acid	$C$. Aspergillus niger
$IV$. Lactic acid	$D$. Clostridium butylicum

Commercial extraction of penicillin was done by

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