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Which of the following pair is character...

Which of the following pair is characterised by swollen lips, thick pigmented skin of hands and legs and irritability

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D
Vitamin `B_5` or Niacin or Nicotinic acid is an essential component of NAD and NADP thus form coenzymes, metabolism of carbohydrates and functioning of gastrointestinal tract. Deficiency of it causes pellagra. Symptoms include rough skin, inflammation of skin which becomes scaly and papillated.
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