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QUESTION
Q488) Which one of the following vitamins can be synthesised by humans? [ HPPMT 2005 ])

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Humans cannot synthesize vitamins A, B1 (thiamine), B2 (riboflavin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), B9 (folate), B12 (cobalamin),C, E and K but are able to synthesize some vitamin B3 (niacin) and D.
Answer : (d)