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': "Which of the following malignancy is associated with underlying progression and spreads characteristically in a stepwise fashion and hence staging the disease is an important 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: None', 'role': 'assistant'}]