This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Anatomy
[{'content': 'B cell marker are all except: \nSelect and explain. \nA. CD 19, B. CD 20, C. CD 10, D. CD 135', 'role': 'user'}, {'content': 'Answer: D \nExplanation: B cell associated markers are CD 10,CD19,CD20,CD21,CD22 and CD23. CD 135 is a proto oncogene.it is also the receptor for the cytokine Flt3 ligand and has the presence of tyrosine kinase activity.its mutation can lead to acute myelogenous leukemia and is associatedwith a poor prognosis.(ref Robbins 9/e590,8th /600)', 'role': 'assistant'}]