This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous QBank, Subject name: Medicine
[{'content': 'Rivaroxaban is an anticoagulant belonging to the category of: \nSelect and explain. \nA. Factor Xa inhibitor, B. Direct thrombin inhibitor, C. Vitamin K antagonist, D. Low molecular weight heparin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is used in the prevention of deep vein thrombosis after hip and knee replacement surgery. Rivaroxaban is also used for treatment of deep vein thrombosis in higher doses. Stroke prevention in non-valvular atrial fibrillation is another role for the drug. It is better avoided in those with significant renal dysfunction', 'role': 'assistant'}]