With the exception of water,which one of the following is possibly the most important accessory chemical substance in industrial processes?

Which of the following statements is correct?

What is produced with the help of $Propionibacterium$ $sharmanii$?

In which of the following places is ethanol used as a fuel in vehicles?

$A$: Fermentation stops when the alcohol concentration in a sugar solution reaches about $13 \%$.
$R$: $Saccharomyces \ cerevisiae$ are killed by the high concentration of alcohol,and zymase activity is inhibited.

Which of the following is used as an immunosuppressive agent?