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': 'Mechanism of action of apixaban is:- \nSelect and explain. \nA. Inhibition of factor Xa, B. Inhibition of thrombin, C. Stimulation of antithrombin, D. Vitamin K antagonism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Apixaban is factor XA blocker. Other XA blockers are:(-xaban) * Rivaroxaban * Edoxaban * Batrixaban Indirect thrombin inhibitor like heparin act by stimulating anti-thrombin 3. Vitamin K antagonists are warfarin, acenocoumarin, bis-hydroxycoumarin.', 'role': 'assistant'}]