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

Which of the following statements regarding gene therapy is/are correct?

Which of the following statements regarding gene therapy is/are correct ?

Which of the following statements regarding gene therapy is/are correct ?

Which one of the following statements about gene mutation is incorrect?

How gene therapy is done to treat ADA deficiency?

Read the following five statement (A to E) about gene therapy and select the option with all correct statement: (A) The first clinical gene therapy was given in 1990 to a patient fo emphysema. (B) Gene therapy is a collection of methods that allows correction of a gene defect. (C) Adenosine deaminase (ADA) enzyme is crucial for the immune system to function. (D) Adenosine deaminase (ADA) deficiency is caused due to the duplication of the gene for adenosine deaminase. (E) ADA deficiency can be cured by bone marrow transplantation.