[A] )It is a synthetic substance that can be introduced to a living body as a medicinal device or replace bodily function or an organ.

[B] It is a peril to the human health system or environment emerging from any biological activity, with microorganisms.

[C] It is the generation of natural products through enzymatic reactions, as in cellular metabolism

[D] It involves the use of living systems, especially microorganisms and cell cultures, to generate molecules and materials on a commercial scale