This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
All are features of Wiskott Aldrich syndrome,except- 
Select and explain. 
A. Descreased IgM level, B. Elevated IgE level, C. Decreased IgA level, D. Decreased ratio of CD4 and CD8 cells
C: Decreased IgA level
Answer: C: Decreased IgA level 
Explanation: None