Identify the drug used for organ transplantation.

Which of the following substrates is used in the formation of alcohol?

The drug $Cyclosporin$ $A$,used in organ transplantation,is obtained from which of the following?

Woodruff $(1941)$ was responsible for the isolation of:

Which is used as an immunosuppressive agent in organ transplant?

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.