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
A patient presents with thrombocytopenia, eczema and recurrent infections. What is the most probable diagnosis? 
Select and explain. 
A. Wiskott Aldrich syndrome, B. A beta gammaglobulinemia, C. Chediak higashi syndrome, D. Lazy leukocyte syndrome
A: Wiskott Aldrich syndrome
Answer: A: Wiskott Aldrich syndrome 
Explanation: Wiskott-Aldrich syndrome (WAS) is an X-linked platelet/immunologic disorder caused by mutations in the WASP gene. The triad of eczema, recurrent infections, and microthrombocytopenia that characterizes WAS only occurs in 27% of the cases. The immunologic defects include low serum concentrations of IgM, while IgA and IgG are normal and IgE is frequently increased. Ref: The Elements of Immunology By Fahim Halim Khan, 2009, Page 413 ; Harrison's 17th ed chapter 310