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According to global statistics compiled by World Health Organization (WHO), between 40-75% of the world's population is deficient in Vitamin D. In 2001, approximately 6% of all Indian women were deficient in Vitamin A but this jumped to 30 % by 2011. These statistics pertain to just 2 of the 12 vitamin deficiencies. How much do you really know about vitamin deficiencies? Would you be able to spot the symptoms? Take our quiz to find out: