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': 'Use of anticoagulant is \nSelect and explain. \nA. Venous thrombosis, B. Aerial thrombosis, C. Vitamin K toxicity, D. Hea failure', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is'a'i.e., Venous thrombosisRef : Katzung /e p. 599; l$hle p. 554Prophylaxis for venous thrombus:Heparin (unfractionated, LMW, or fondaparinux) and oral anticoagulants (warfarin).", 'role': 'assistant'}]