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(D) Vitamin $K$ is a fat-soluble vitamin that plays a crucial role in the process of blood coagulation.It acts as a cofactor for the enzyme gamma-glut

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Prothrombin

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(D) Vitamin $K$ is a fat-soluble vitamin that plays a crucial role in the process of blood coagulation.It acts as a cofactor for the enzyme gamma-glutamyl carboxylase,which is responsible for the carboxylation of specific glutamic acid residues in several clotting factors,including prothrombin (Factor $II$),Factor $VII$,Factor $IX$,and Factor $X$.Therefore,a deficiency of vitamin $K$ leads to an impaired synthesis of these clotting factors,most notably resulting in a significant reduction in the levels of functional prothrombin in the blood,which increases the time required for blood to clot.

The deficiency of vitamin $K$ results in the reduction of

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