This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CLL & CML, Subject name: Medicine
BCL-2 inhibitor used in CLL is? 
Select and explain. 
A. Fludarabine, B. Cladiribine, C. Pentostatin, D. Venetoclax
D: Venetoclax
Answer: D: Venetoclax 
Explanation: BCL- 2 inhibitor used in CLL is Venetoclax. It works by promoting apoptosis. CLL - Most common Blood Cancer (leukemia) in Adult population. Rx- Chemoimmunotherapy + Monoclonal Antibody F C R Fludrabine Cyclophosphamide Rituximab P C R Pentostatin Cyclophosphamide Rituximab