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QUESTION
Q170) Animals do not synthesise .... [ JKCMEE 2000 ]

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Most vitamins are obtained with food, but a few are obtained by other means. For example, microorganisms in the intestine — commonly known as "gut flora" — produce vitamin K and biotin, while one form of vitamin D is synthesized in the skin with the help of the natural ultraviolet wavelength of sunlight.
Answer : (b)