A drug called Coumadin interferes with the action of vitamin K in the liver. What effect will Coumadin have on blood-clotting mechanisms?
A) Coumadin will make it necessary for the patient to eat extra leafy green vegetables.
B) Vitamin K will not be absorbed from the digestive tract.
C) Nothing, because vitamin K is not necessary for blood clotting.
D) The liver will not be able to produce needed clotting factors.
Answer: D
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