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
Transformation of CLI/SLL into DLBCL is called - 
Select and explain. 
A. Richter syndrome, B. Evans syndrome, C. Li Fraumeni syndrome, D. Kostmann syndrome
A: Richter syndrome
Answer: A: Richter syndrome 
Explanation: 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).