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
Ataxaia telengiectasia is associated with all of the following except : 
Select and explain. 
A. Recurrent sinopulmonary infections, B. Lymphatic reticular malignancies, C. Increased fraction of IgA immunoglobulins, D. Insulin resistance
C: Increased fraction of IgA immunoglobulins
Answer: C: Increased fraction of IgA immunoglobulins 
Explanation: Answer is C (Increased fraction of IgA immunoglobulins) : Although 8 lymphocytic development is normal most patients are deficient in serum IgE and IgA - Harrison