निम्नलिखित में से किस विटामिन की कमी के कारण बच्चों में रिकेट्स (सूखा रोग) होता है?

Which vitamin is essential during childhood for maintaining normal vision and supporting immune function?

Scurvy occurs due to the deficiency of which of the following vitamins?

Match LIST-I with LIST-II regarding the forms of vitamins and associated conditions based on their descriptions: LIST-I (Term / Biochemical Form) A. Ergocalciferol (Vitamin D2) B. Cholecalciferol (Vitamin D3) C. Osteomalacia D. Ascorbic Acid (Vitamin C) LIST-II (Description / Source) I. A water-soluble vitamin that strengthens blood vessels and helps in the absorption of iron II. A condition in adults characterized by bone pain, weakness, and fragile bones that break easily III. A distinct form of Vitamin D that is found in plant sources IV. A distinct form of Vitamin D produced in human skin and found in animal sources Choose the correct answer from the options given below: