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
[{'content': 'Oral anticoagulant which inhibit thrombin directly- \nSelect and explain. \nA. Dabigatran, B. Dicumarol, C. Warfarin, D. Rivaroxaban', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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Bivalirudino Lepirudino Melagatran o Desirudin Oral direct thrombin inhibitors o Dabigatran (recent)o Ximelagatran (withdrawn)", 'role': 'assistant'}]