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: Pediatrics
A child with an obvious rash presents with recurrent infections. The investigation revealed decreased platelet count and reduced IgM.  Which of the following is the most likely diagnosis – 
Select and explain. 
A. Idiopathic Thrombocytopenic Purpura, B. Thrombotic Thrombocytopenic Purpura, C. Wiskott–Aldrich Syndrome, D. Di' George anomaly
C: Wiskott–Aldrich Syndrome
Answer: C: Wiskott–Aldrich Syndrome 
Explanation: The classical triad of rash, thrombocytopenia and recurrent infection (immunodeficiency; ↓-IgM) suggest a diagnosis of Wiskott-Aldrich Syndrome.