Correct Answer: Vitamin C

Solution : The correct option is Vitamin C.

Milk is a good source of calcium and protein, and milk includes lactose, a naturally occurring carbohydrate, but it lacks Vitamin C (ascorbic acid), which is typically found in fruits and vegetables. Plant-based foods, such as fruits and vegetables, are high in vitamin C. Animals, including humans, do not synthesise Vitamin C and must acquire it from their diet.