This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'As compared to unfractionated heparin, low molecular weight heparins: \nSelect and explain. \nA. Are absorbed more uniformly when given subcutaneously, B. Require more frequent laboratory monitoring, C. Can be given to patients with heparin induced thrombocytopenia, D. Predispose to a higher risk of osteopenia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Unlike unfractionated heparin, LMW heparins have more consistent\xa0bioavailability as they get absorbed uniformly when given s.c.\xa0and thus do not require monitoring.\nAdverse effects of both types of heparins are similar.\nBoth are contra-indicated in heparin-induced thrombocytopenia where the agent of choice is direct thrombin inhibitors like lepirudin.', 'role': 'assistant'}]