The deficiency disease 'pellagra' is caused by lack of:
A. Riboflavin
B. Biotin
C. Niacin
D. Thiamine
Answer: Option C
Solution (By JKSSB Mock Tests)
Pellagra, characterized by dermatitis, diarrhea, and dementia (3 Ds), is due to deficiency of niacin (vitamin B₃) or its precursor tryptophan. Niacin is part of NAD and NADP coenzymes.
Explanation:
Vitamin C (ascorbic acid) is water-soluble and easily destroyed by heat, light, and oxidation. Cooking reduces its content in food. Vitamin A is fat-soluble and relatively stable, D and K also fat-soluble and more stable. Vitamin C must be consumed regularly.
Explanation:
The diaphragm is a dome-shaped skeletal muscle that contracts during inspiration, flattening and increasing thoracic volume. The external intercostal muscles assist.
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