Which anticoagulant is most commonly monitored using INR? (PSC - Lumbini 2083)

 # Which anticoagulant is most commonly monitored using INR? (PSC - Lumbini 2083)

A. Aspirin

B. Heparin

C. Warfarin

D. Clopidogrel

The correct answer is C. Warfarin.

 Warfarin is a Vitamin K antagonist whose therapeutic efficacy and bleeding risk must be routinely monitored using the International Normalized Ratio (INR). Antiplatelets (like Aspirin and Clopidogrel) do not require routine INR monitoring.