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
[{'content': 'Both B and T cell defect is present in all EXCEPT: \nSelect and explain. \nA. SCID, B. Common Variable immunodeficiency, C. Wiskott-Aldrich syndrome, D. X-linked Agammaglobulinemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: X-linked Agammaglobulinemia is a B cell defect', 'role': 'assistant'}]