This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'Not a B cell marker \nSelect and explain. \nA. CD19, B. CD20, C. CD34, D. CD10', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]