Prolonged deficiency of nicotinic acid produces

Osteomalacia

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Xerophthalmia

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Pellagra

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Anaemia

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Solution

The correct option is C Pellagra
Vitamin $B_{3}$ or Niacin (Nicotinic Acid) is a water soluble vitamin essential for normal cellular metabolism as it is precursor of co-enzymes nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP).
Its deficiency causes a disease which is characterized with scaly, pigmented skin, irritation of the GI tract (diarrhea), known as Pellagra.
Hence, Option C is correct.

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