Assertion: Adenosine deaminase (ADA) deficiency can be corrected by gene therapy.
Reason: Bone narrow transplantation cannot completely cure ADA deficiency.
a. Both assertion and reason are true, and reason is the correct explanation of assertion.
b. Both assertion and reason are true, but reason is not the correct explanation of assertion.
c. Assertion is true but reason is false
d. Both assertion and reason are false.