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Vitamin K is required for

1. change of prothrombin to thrombin
2. synthesis of prothrombin
3. synthesis of fibrinogen
4. formation of thromboplastin

Correct answer: synthesis of prothrombin

Solution

Vitamin K is essential for hepatic synthesis of prothrombin (factor II) and other clotting factors. Without it, the body cannot properly produce functional prothrombin, which then impairs clot formation.

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