Identify the factor below that does not require vitamin K for its procoagulant activity.

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Prothrombin (Factor II)Stable factor (Factor VII)Christmas factor (Factor IX)Plasma thromboplastin antecedent (Factor XI)

Explanation

Factors II, VII, and IX are all vitamin K-dependent clotting factors essential for coagulation. In contrast, Factor XI functions independently of vitamin K in the clotting cascade.