A 5 year old female patient complains of deformed shape of legs. Patient is a strict vegetarian. Lab investigations reveal elevated levels of alkaline phosphatase. This patient is suffering from deficiency of a vitamin whose recommended dietary allowance is-
Deficiency of vitamin D causes rickets in children and osteomalacia in adults. The weight bearing bones are bent to form bow-legs.  In rickets, the plasma level of calcitriol  is  decreased  and  alkaline phosphatase  activity  is  elevated. The daily requirement of vitamin D is 400IU or 10 mg of cholecalciferol.
Satyanarayana- Biochemistry, 3rd edition, pg-127
300IU
400IU
500IU
600IU