Which one of the following is a fat-soluble vitamin and its related deficiency diseases?
(b)Ascorbic acid- Scurvy
(c)Retinal- Xerophthalmia
(d)Cobalamin- Beriberi

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Hint: It is important for growth and development, for the maintenance of the immune system, and for good vision. It additionally works during an altogether different part as retinoic corrosive, which is a pivotal hormone-like protein for epithelial and different cells.

Complete answer:
Xerophthalmia is a nutrient A (retinol) inadequacy issue that is brought about by the stoppage of lacrimal action. Cornea and eyelids become dry and ulcerated. It leads to swelling of dry eyelids and the opacity of the cornea. Xerophthalmia, if untreated, leads to blindness. Scurvy is vitamin C deficiency disease, Beriberi is vitamin B1 deficiency disease and Pellagra is caused due to deficiency of niacin.

Additional information:
People can obtain vitamin A through dietary sources.
Animal sources provide preformed vitamin A or retinol. This sort is prepared for the body to utilize.
Plant sources provide carotenoids, like beta-carotene, which may be a powerful antioxidant. They are converted into Vitamin A by the body.
Hence, arrangements of fixings regularly show nutrient A substance as "nutrient A RAE." RAE signifies“retinol activity equivalents.”
Animal sources of vitamin A include:
fish liver oil
beef liver
cheese, milk, and other dairy products
Sources of beta carotene include:
sweet potato
kale, spinach, and other green, leafy vegetables
black-eyed peas
fortified breakfast cereals

So the correct answer is ‘ Retinal- Xerophthalmia’.

Note: A wide range of nutrients A have a beta-ionone ring to which an isoprenoid chain is appended, called a retinyl gathering. Both structural features are essential for vitamin activity. The orange pigment of carrots (beta-carotene) is often represented as two connected retinyl groups, which are utilized in the body to contribute to vitamin A levels. ɑ-carotene and gamma-carotene also have a single retinyl group and it gives them some vitamin activity.