This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins, Subject name: Biochemistry
[{'content': 'Water soluble form of Vitamin K \nSelect and explain. \nA. Phylloquinone, B. Menaquinone, C. Menadione, D. None', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) Menadione Ref: Harper's Biochemistry 30th edn. 1554 * Menadione is the water soluble form of vitamin K. Forms of VITAMIN K Vitamin K1 Vitamin K2 Vitamin K3 Aka Phylloquinone Menaqui- none Menadione Source Several green vegetables and prepared synthetically Synthesized by Gl bacteria, supplies 50% human requirement Synthetic, Analog of 1,4-naphtho- quinine Solubility Fat soluble Fat soluble Diphosphate salt is Water soluble * Vitamin K Is the Coenzyme for Carboxylation of Glutamate in Postsynthetic Modification of Calcium Binding Proteins. Vitamin K Is Also Important in Synthesis of Bone Calcium Binding Proteins. * Dicumarol is an anticoagulant that functions as a vitamin K antagonist.", 'role': 'assistant'}]