<prompt> Menadione is analog of?Vitamin KVitamin AVitamin DVitamin C  <response>: The principal role of vitamin K is in the posttranslational modification of various blood clotting factors, in which it serves as a coenzyme in the carboxylation of ceain glutamic acid residues present in these proteins.Vitamin K exists in several forms, for example, in plants as phylloquinone or vitamin K1, and in intestinal bacterial flora as menaquinone or vitamin K2. A synthetic form of vitamin K, menadione, is availableReference: Lippincott edition 5; page no: 389 