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
Which of the following is a Direct thrombin inhibitors? 
Select and explain. 
A. Lepirudin, B. Argatroban, C. Bivalirudin, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. D. All of the aboveDirect thrombin inhibitorsMechanism of action: Thrombin inhibitionExample:a. Lepirudinb. Argatrobanc. Bivalirudind. Ximelagatrane. Dabigatran (oral drug).