This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anticoagulants and Coagulants, Subject name: Pharmacology
[{'content': 'Which of the following is a low molecular weight heparin: \nSelect and explain. \nA. Hirudin, B. Enoxaparin, C. Tranexamic acid, D. Lepirudin', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Enoxaparin* Enoxaparin is a low molecular weight heparin.* It acts by inhibiting factor Xa.* LMWH usually doesn't need monitoring because of consistent bioavailability.* Drugs under LMWH:# Enoxaparin# Dalteparin# Tinzaparin# RabiparinAlso Know* Hirudin along with Lepirudin and Bivalirudin is an anticoagulant which is act by direct thrombin (factor IIa) inhibition.* Tranexamic acid is an anti-fibrinolytic agent.", 'role': 'assistant'}]