question: Q:A 5-year-old male is brought to his pediatrician after recurrent, prolonged upper respiratory infections over a period of several months. Physical exam reveals petechiae on the patient’s legs and arms. Laboratory studies show hemoglobin: 10 g/L, platelet count: 35,000/mm^3, leukocyte count: 6,600/mm^3. A bone marrow aspiration shows an abundance of lymphoblasts indicative of acute lymphoblastic leukemia (ALL). Positive immunostaining for which of the following would support a diagnosis of precursor B-cell leukemia?? 
  {'A': 'TdT, HER-2', 'B': 'CD2, CD8', 'C': 'CD19, CD10', 'D': 'CD30, CD15', 'E': 'CD4, CD5'},