Discussion
Phrynoderma is caused by the deficiency of :
Answer: A
The keyed answer is essential fatty acids.
Phrynoderma, or 'toad skin', is a follicular hyperkeratosis: rough, horny papules around the hair follicles of the elbows, knees and buttocks. It was first linked to vitamin A deficiency, but Indian studies found that it often cleared with essential fatty acids (as in safflower oil) and B-complex vitamins, and Indian nutrition textbooks list it as a sign of essential fatty acid deficiency. Vitamin A is not among the options.
Thiamin deficiency causes beriberi, vitamin C deficiency scurvy, and vitamin D deficiency rickets and osteomalacia, none of which produces phrynoderma.
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