question: Q:A 30-year-old Caucasian male is brought to the emergency room for recurrent diarrhea. He has had multiple upper respiratory infections since birth and does not take any medications at home. It is determined that Giardia lamblia is responsible for the recurrent diarrhea. The physician performs a serum analysis and finds normal levels of mature B lymphocytes. What other finding on serum analysis predisposes the patient to recurrent diarrheal infections?? 
  {'A': 'Deficiency in CD8+ T cells', 'B': 'Deficiency in neutrophils', 'C': 'Deficiency in IgA', 'D': 'Deficiency in NK cells', 'E': 'Deficiency in IgG'},