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Correct Answer - A
Ans. is 'a' i.e., Vitamin A
Hypervitaminosis A
Caused by consumption of food rich in vitamin A like fish or liver (not
by excessive intake of carotenoids as the conversion of carotene to
vitamin A is regulated).
Mechanism of toxicity:
Suppresses osteoblasts and stimulates osteoclasts.
High retinol concentrations stimulate lysosomal enzyme release and
cause local tissue damage.
Features include anorexia, irritability, headache, skin peeling,
vomiting. Headache, vomiting and papilledema are found to be
caused by increase in intracranial tension. Hence this condition is
called as pseudotumourcerebri. As vitamin A stimulates osteoclasts,
hypercalcemia, bony projections, pathological fractures are also
observed as features