This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics And Genetic Disorders, Subject name: Pediatrics
Gene therapy is most commonly targeted against: 
Select and explain. 
A. SCID, B. cancer, C. cystic fibrosis, D. Leukemia
A: SCID
Answer: A: SCID 
Explanation: a. SCID(Ref: Nelson's 20/e p 584-586)FDA-approved gene therapy is used for ADA-SCID, Leber's congenital amaurosis, multiple myeloma & Adrenoleukodystrophy