The nutrient that is not found in milk :

a) Vitamin D  This is the correct answer

• While milk is often fortified with Vitamin D in many countries (especially in the US and Canada), naturally occurring milk does not contain significant amounts of Vitamin D
• Milk is an excellent source of calcium, but it needs Vitamin D to be added artificially to help with calcium absorption
• Natural, unfortified milk contains very little to no Vitamin D

b) Vitamin C

• Milk does contain small amounts of Vitamin C, though not in large quantities
• Fresh milk has some Vitamin C, but it decreases with heat treatment and storage

c) Calcium

• INCORRECT - Milk is one of the richest sources of calcium
• This is what milk is most famous for nutritionally
• One cup of milk provides about 300mg of calcium

d) Proteins

• INCORRECT - Milk is an excellent source of high-quality proteins
• Contains casein and whey proteins
• Provides all essential amino acids

Answer: Option (a) Vitamin D

Milk naturally lacks Vitamin D, which is why many countries mandate or encourage fortification of milk with Vitamin D to improve public health and prevent deficiencies.