The body can synthesize all of the vitamin D it needs with just sufficient amounts of Choose...sunlightcalciumvitamin Acholesterol. Vitamin D is considered both a vitamin and a Choose...mineralhormoneneurotransmitterfatty acid. Adequate vitamin D prevents a childhood disease called Choose...scurvymeaslesricketsnone of the above. The liver and adipose tissue store vitamin D. When it is needed the liver and kidneys convert stored vitamin D to Choose...calcitriolcalcitoninosteoclasttocopherol, which works with parathyroid hormone and Choose...calcitriolcalcitoninosteoclasttocopherol from the thyroid gland to regulate blood calcium levels. Other than fortified products, good amounts of vitamin D can also be found in Choose...fish oilsbeefoatslentils. In the United States, rickets is sometimes seen in children who have Choose...fat malabsorption conditionsParkinson's diseasemultiple sclerosisnone of the above. Choose...HypercalcemiaOsteoporosisOsteomalaciaHyperkeratosis is a related skeletal problem seen in adults with a vitamin D deficiency that results in softened bones and bending of the spine.