This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Pharmacology
[{'content': 'A patient after valve replacement will require follow up treatment with \nSelect and explain. \nA. Warfarin, B. ACE inhibitors, C. Beta blockers, D. Thiazide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Warfarin-Warfarin being oral anticoagulant is used as prophylaxis after valve replacement because of propensity of these pts. developing thromboembolism is higher. Rx- warfarin + Inj heparin -life time use Heparin is discontinued after five days where as warfarin is taken lifelong. As warfarin takes at least 5 days to show its effect. Note-with warfarin therapy INR monitoring should be done.', 'role': 'assistant'}]