How do bioactive molecules of fungal origin help in restoring good health of humans ?

Fill up the blanks.

$(I)$ Ethanol is produced by $…a…$

$(II)$ Large scale production of beverages inindustries is done in very large vesselscalled $ …b…$

$(III)$ Penicillin is discovered by $…C…$

$(IV)$ LAB checks disease causing microbes in $…d…$ $a$ to $d$ in the above statements refers to

Citric acid is produced by

Lactic acid is produced by

Yeast is used in the production of