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': 'Ataxaia telengiectasia is associated with all of the following except : \nSelect and explain. \nA. Recurrent sinopulmonary infections, B. Lymphatic reticular malignancies, C. Increased fraction of IgA immunoglobulins, D. Insulin resistance', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer is C (Increased fraction of IgA immunoglobulins) : Although 8 lymphocytic development is normal most patients are deficient in serum IgE and IgA - Harrison', 'role': 'assistant'}]