This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
[{'content': 'Which of the following anticoagulants is an oral direct Xa inhibitor? \nSelect and explain. \nA. Fondaparinux, B. Dabigatran, C. Rivaroxaban, D. Lepirudin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Drugs ending with XABAN are Xa inhibitor. Rivero XABAN ApiXABAN Edo XABAN BefXABAN Dabigatran:- Direct Thrombin inhibitor Only oral agent in Class(DTI) Can reverse with Idarucizumab Fondaparinux :- LMWH which acts only on Factor Xa Lepirudin:- Direct Thrombin Inhibitor', 'role': 'assistant'}]