This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Medicine
[{'content': 'Which of the following is a Direct thrombin inhibitors? \nSelect and explain. \nA. Lepirudin, B. Argatroban, C. Bivalirudin, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. All of the aboveDirect thrombin inhibitorsMechanism of action: Thrombin inhibitionExample:a. Lepirudinb. Argatrobanc. Bivalirudind. Ximelagatrane. Dabigatran (oral drug).', 'role': 'assistant'}]