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
Which one of the following is direct thrombin inhibitor: 
Select and explain. 
A. Enoxaparin, B. Dalteparin, C. Fondaparinux, D. Argatroban
D: Argatroban
Answer: D: Argatroban 
Explanation: Argatroban