The vitamin that is produced in the human skin upon exposure to sunlight and is essential for calcium absorption in the intestine is

Vitamin D is synthesised in the skin when ultraviolet rays from sunlight convert 7-dehydrocholesterol to cholecalciferol (Vitamin D3). It promotes the absorption of calcium and phosphorus from the small intestine, making it vital for bone and teeth development. Deficiency leads to rickets in children and osteomalacia in adults.