GENERAL KNOWLEDGE

Detailed explanation-1: -The vitamin which will be synthesized by the physical body is vitamin D . Vitamin D is synthesized by the human skin when exposed to sunlight. Hence option A is correct .

Detailed explanation-2: -A unique aspect of vitamin D as a nutrient is that it can be synthesized by the human body through the action of sunlight. These dual sources of vitamin D make it challenging to develop dietary reference intake values. Vitamin D, also known as calciferol, comprises a group of fat-soluble seco-sterols.

Detailed explanation-3: -Vitamin D3 (cholecalciferol) is synthesized in the skin by the reaction of 7-dehydrocholesterol with UVB radiation, present in sunlight with an UV index of three or more. Vitamin D4 is an analog scientifically known as 22-dihydroergocalciferol. Vitamin D5 (sitocalciferol) is an analog created from 7-dehydrositosterol.

Detailed explanation-4: -Vitamin D aids in the absorption of calcium, helping to form and maintain strong bones. Recent research also suggests that sufficient intake of this fat-soluble vitamin may provide protection from and decrease an individual’s risk of developing osteoporosis, hypertension, cancer, and several autoimmune diseases.