This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anticoagulants and Coagulants, Subject name: Pharmacology
Oral anticoagulant which inhibit thrombin directly- 
Select and explain. 
A. Dabigatran, B. Dicumarol, C. Warfarin, D. Rivaroxaban
A: Dabigatran
Answer: A: Dabigatran 
Explanation: Ans. is 'a' i.e., Dabigatran Parentral direct thrombin inhibitors o Argatrobano Hirudino Bivalirudino Lepirudino Melagatran o Desirudin Oral direct thrombin inhibitors o Dabigatran (recent)o Ximelagatran (withdrawn)