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
Parenteral direct thrombin inhibitor ? 
Select and explain. 
A. Ximelagatran, B. Dabigatran, C. Argatroban, D. Heparin
C: Argatroban
Answer: C: Argatroban 
Explanation: Ans. is 'c' i.e., Argatroban Parentral direct thrombin inhibitors Argatroban Bivalirudin Hirudin Lepirudino Melagatran Desirudin Oral Direct thrombin inhibitors Dabigatran (recent) Ximelagatran (withdrawn)