This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Medicine
[{'content': 'Which of the following is the mechanism of action of Penta saccharide? \nSelect and explain. \nA. Factor XA inhibition, Thrombin inhibition, B. Factor XA inhibition, C. Antithrombin inhibitor, D. Thrombin inhibition', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Factor XA inhibitionPenta saccharideMechanism of action: Factor Xa inhibitionExample: Fondaparinux, IdraparinuxNewer factor Xa inhibitor:a. Rivaroxabanb. Apixaban Both are given orally.', 'role': 'assistant'}]