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': 'Orally acting direct thrombin inhibitor is? \nSelect and explain. \nA. Bivalirudin, B. Ximelgatran, C. Lepirudin, D. Argatroban', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ximelgatran is an oral direct thrombin inhibitor. All the other given drugs are parenterally acting direct thrombin inhibitor. From medical pharmacology padmaja 4th edition Page no 334', 'role': 'assistant'}]