In some children,deficiency can be cured by which transplantation?

Euphenics is

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

$A$ patient is suffering from $ADA$ deficiency. Can he be cured? How?

Given below are two statements:
Statement $I$: $Adenosine \ deaminase$ is crucial for the immune system to function.
Statement $II$: $Adenosine \ deaminase$ deficiency can be cured only by bone marrow transplantation.
In the light of the above statements, choose the correct answer from the options given below.

The genetic defect-adenosine deaminase $(ADA)$ deficiency may be cured permanently by