Medicinal Uses of Microbes

What is the medicinal use of toad?

What is the medicinal use of narcotic drugs ?

Assertion : Bacteria and fungi are used to make medicines. Reason : These medicines are used to cure viral diseases.

Assertion: Not all the microbes are harmful, several microbes are useful to man in diverse ways. Reason: Microbes are used to ferment fish, soyabean and bamboo-shoot to make food.

Which one of these microbes is used in the commercial production of ethanol?