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
[{'content': 'All are features of Wiskott Aldrich syndrome,except- \nSelect and explain. \nA. Descreased IgM level, B. Elevated IgE level, C. Decreased IgA level, D. Decreased ratio of CD4 and CD8 cells', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]