Yeasts poison themselves to death when the concentration of alcohol reaches about $........$ (in $\%$)

Statins,used as blood cholesterol-lowering agents,are extracted from:

Vitamin $B_{12}$ is produced directly during the course of fermentation by

$S$ - Statement: The fermentation process of microbes is also used to produce certain vitamins.
$R$ - Reason: Riboflavin is produced by $Ashbya$ $gossypii$.

Alcoholic beverages are obtained with the help of

Match the Column-$I$ and Column-$II$.

Column-$I$	Column-$II$
$1$. Aspergillus niger	$(A)$ Acetic acid
$2$. Acetobacter aceti	$(B)$ Butyric acid
$3$. Clostridium butyricum	$(C)$ Citric acid
$4$. Lactobacillus	$(D)$ Lactic acid