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': 'Low molecular weight heparin inhibits : \nSelect and explain. \nA. Factor Xa, B. Factor Xa and Ha, C. Factor Ha, D. Factors II, VII, IX and X', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]