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
A patient after valve replacement will require follow up treatment with 
Select and explain. 
A. Warfarin, B. ACE inhibitors, C. Beta blockers, D. Thiazide
A: Warfarin
Answer: A: Warfarin 
Explanation: 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.