<prompt> Burning foot syndrome is due to deficiency of which component of vitamin B complex -RiboflavinThiamineNiacinPentothenic acid  <response>: Pantothenic acid vit B5:- Human blood normally contains 18-35 mg of pantothenic acid per 100 ml blood . Mostly present in cells as coenzyme A. The daily requirement: 10 mg Deficiency: Dr Gopalan ,a world renowned nutritionist from India, linked the burning feet syndrome with pantothenic acid deficiency. Manifested by pain, numbness in the toes, sleeplessness, fatigue etc. Reference: Park;s textbook of community medicine, 23 rd edition, pg no. 620 