A 28-year-old woman reports easy bruising and prolonged bleeding after minor cuts. Laboratory shows prolonged prothrombin time. Which vitamin deficiency is most consistent with this presentation?
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Correct answer: Vitamin K
Vitamin K is essential for gamma-carboxylation of clotting factors II, VII, IX and X; its deficiency impairs clotting and causes bleeding tendency, bruising, and prolonged PT.
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