This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': "Classical markers for Hodgkin's disease - \nSelect and explain. \nA. CD15 and CD30, B. CD15 and CD22, C. CD15 and CD20, D. CD20 and CD30", 'role': 'user'}, {'content': "Answer: A \nExplanation: Classical markers for Hodgkin's disease are CD15 and CD30.\nCD15 and CD30 are positive in all variants of Hodgkin's disease except lymphocyte predominance.\nLymphocyte predominance variant is positive for CD20.", 'role': 'assistant'}]