Which vitamin functions as a coenzyme in blood coagulation and is essential for the synthesis of prothrombin in the liver?

💡 Solution & Explanation

Vitamin K acts as an essential enzymatic cofactor required by hepatic carboxylase for post-translational modification of clotting factors like prothrombin to facilitate hemostasis. Vitamin A supports visual pigment synthesis and epithelial maintenance, while Vitamin C functions as an antioxidant and collagen-forming agent.