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: Pathology
[{'content': "Which of the following malignancy is associated with underlying progression and spreads characteristically in a stepwise fashion and hence staging the disease is an impoant prognostic factor? \nSelect and explain. \nA. Hodgkin's lymphoma, B. Multiple myeloma, C. Mature T cell NHL, D. Mature B cell NHL", 'role': 'user'}, {'content': 'Answer: A \nExplanation: The staging system used for Hodgkin lymphoma is the Lugano classification, which is based on the older Ann Arbor system. It has 4stages, labeled I, II, III, and IV. For limited stage(I or II) HL that affects an organ outside of the lymph system, the letter E is added to thestage (for example, stage IE or IIE).', 'role': 'assistant'}]