<prompt> Which of the following fat soluble vitamin has been identified to function as a coenzyme?Vitamin AVitamin KVitamin EVitamin D  <response>: Most of the water soluble vitamins exert the functions through their respective coenzymes while only one fat soluble vitamin K has been identified to function as a coenzyme.Reference: Satyanarayana- Biochemistry, 3rd edition, pg-117 