In the context of 'gene therapy' for ADA deficiency, which of the following approaches is considered a permanent cure?
- AEnzyme replacement therapy (ERT) with periodic infusion of functional ADA.
- BIntroduction of functional ADA cDNA into lymphocytes by retroviral vector, followed by periodic infusion.
- CIntroduction of genes isolated from bone marrow cells producing ADA into cells at early embryonic stages.
- DBone marrow transplantation.
✓ Correct answer: C
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