Read the paragraph given below and answer the question.

If a person is born with a hereditary disease, can a corrective therapy be taken for such a disease? Gene therapy is an attempt to do this. Gene therapy is a collection of methods that allows correction of a gene defect that has been diagnosed in a child/embryo. Here genes are inserted into a person's cells and tissues to treat disease.

ADA deficiency is caused due to:

Deletion of gene for adenosine diaminase

The correct answer is Option (2) → Deletion of gene for adenosine diaminase