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: Pharmacology
[{'content': 'Adenosine deaminase inhibitors is - \nSelect and explain. \nA. Pentostatin, B. TxA2, C. Cladribine, D. All', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Pemntostatin", 'role': 'assistant'}]