ASSERTION: ADA deficiency can not be cured permanently in adults. REASON: The genetically engineered lymphocytes survive only for a limited time in body.

Both assertion and reason are true and reason is the correct explanation of assertion . Both assertion and reason are true but reason is not the correct explanation of assertion. Both assertion and reason are false. Assertion is true but reason is false.

Both assertion and reason are true and reason is the correct explanation of assertion .

The genetically engineered lymphocytes are not immortal and survive only for a limited time in body.. Gene therapy at an adult stage requires periodic infusion of genetically engineered lymphocytes. However, if the gene therapy is done at early embryonic stages, it could be a permanent cure.