Final answer:
B. Warfarin (Coumadin). Warfarin (Coumadin) is a commonly used anticoagulant in the treatment of stroke or heart attack patients.
Step-by-step explanation:
An anticoagulant is a substance that opposes coagulation. One drug commonly used as an anticoagulant is Warfarin (Coumadin). Coumadin is frequently prescribed to prevent excessive blood clotting in stroke or heart attack patients. It works by inhibiting the synthesis of certain clotting factors in the liver.