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: Medicine
[{'content': 'Transformation of CLI/SLL into DLBCL is called - \nSelect and explain. \nA. Richter syndrome, B. Evans syndrome, C. Li Fraumeni syndrome, D. Kostmann syndrome', 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer- A. Richter syndromeRichter's transformation is development of an aggressive large-cell lymphoma in the setting of underlying chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL).", 'role': 'assistant'}]