Which of the following statements is incorrect about gene therapy in ADA deficiency ?

Options

A. A functional ADA c - DNA is introduced in the lymphocytes of the patient and then these lymphocytes are re - introduced in the patient
B. A functional ADA gene is introduced in the monocytes of the patients and then these monocytes are re- introduced of the patient .
C. Enzyme Adenosine deaminase is introduced in the blood of the patient .
D. The mutated gene on chromosome number 20 is treated with certain chemicals.

Answer

A