Sir Alexander Fleming extracted penicillin from

Match the following enzymes in Column-$I$ with their source in Column-$II$.

Column-$I$	Column-$II$
$A$. Pectinase	$i$. $Saccharomyces \text{ } cerevisiae$
$B$. Lipase	$ii$. $Aspergillus \text{ } niger$
$C$. Invertase	$iii$. $Trichoderma \text{ } konigii$
$D$. Cellulase	$iv$. $Candida \text{ } lipolytica$

Match the following bacteria/fungi of Column $I$ with their commercial products of Column $II$.

Column $I$	Column $II$
$A$. Lactobacillus	$p$. Butyric acid
$B$. Aspergillus niger	$q$. Acetic acid
$C$. Acetobacter aceti	$r$. Lactic acid
$D$. Clostridium butylicum	$s$. Citric acid

Select the code for the correct answer from the options given below.

Yeast is useful for the production of ........

Define/Explain: $Fermentors$.

Which of the following statements is correct?