The first clinical gene therapy was given for treating

Human insulin is produced from which transgenic species?

The name of the drug used in cancer treatment produced by biotechnology is:

Which new strain of bacteria was produced through biotechnology?

Which rays are used in a $CT$ scan?

With regard to insulin,choose the correct options.
$(a)$ $C$-peptide is not present in mature insulin.
$(b)$ The insulin produced by $rDNA$ technology has $C$-peptide.
$(c)$ The pro-insulin has $C$-peptide.
$(d)$ $A$-peptide and $B$-peptide of insulin are interconnected by disulphide bridges.
Choose the correct answer from the options given below.