<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .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 patients legs and arms. Laboratory studies show hemoglobin: 10 gL, platelet count: 35,000mm3, leukocyte count: 6,600mm3. 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,  <response>: Based on the information provided in the question stem, this is a case of a 5-year-old male with recurrent upper respiratory infections, petechiae, low hemoglobin, thrombocytopenia, and leukopenia. The bone marrow findings of lymphoblasts indicate acute lymphoblastic leukemia ALL. The question is asking which immunostaining pattern would support a diagnosis of precursor B-cell ALL.Choice A presents TdT and HER-2, which are not specific for precursor B-cell ALL. TdT can be positive in both B and T lineage ALL. Choice B presents CD2 and CD8, which are T cell markers and would not support a diagnosis of precursor B-cell ALL.Choice C presents CD19 and CD10. CD19 is a pan B cell marker and CD10 is a common marker for precursor B-cell ALL. This would support a diagnosis of precursor B-cell ALL.Choice D presents CD30 and CD15 which are markers of Hodgkin lymphoma and would not support precursor B-cell ALL. Choice E presents CD4 and CD5 which are T cell markers and would not support a diagnosis of precursor B-cell ALL.C: CD19, CD10 