Ethanol is produced by fermenting of malted cereals by . . . . . . .

Assertion: Vitamin $B_2$ is found in cereals,green vegetables,brewer's yeast,egg white,milk,and liver.
Reason: It can be commercially produced by some yeasts.

Choose the correct matching pair for the following table:

Column-$I$ (Microbe)	Column-$II$ (Product)
$(I)$ Aspergillus niger	$(p)$ Lactic acid
$(II)$ Acetobacter aceti	$(q)$ Acetic acid
$(III)$ Lactobacillus	$(r)$ Citric acid
$(IV)$ Clostridium butylicum	$(s)$ Butyric acid

Which of the following enzymes is produced on an industrial scale?

$A$ chemical produced by a microorganism that inhibits the growth of another microorganism is called a/an......

Which of the following statements is correct?