This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Primary Immunodeficiency, Subject name: Pediatrics
Both B and T cell defect is present in all EXCEPT: 
Select and explain. 
A. SCID, B. Common Variable immunodeficiency, C. Wiskott-Aldrich syndrome, D. X-linked Agammaglobulinemia
D: X-linked Agammaglobulinemia
Answer: D: X-linked Agammaglobulinemia 
Explanation: X-linked Agammaglobulinemia is a B cell defect