The colour of cow's milk is slightly yellowish due to presence of:

Correct option is B

The yellowish color of cow’s milk is due to the presence of carotene, a precursor of Vitamin A.

Explanation:
● Carotene is a pigment found in cow feed, such as green fodder, which gives milk its yellowish hue.
● It is fat-soluble and gets dissolved in the milk's fat content.
● The concentration of carotene varies depending on the cow’s diet.
● Carotene also contributes to the nutritional value of milk by acting as an antioxidant.
● In contrast, buffalo milk appears white due to its lower carotene content.
● Milk fortified with Vitamin A is often recommended for better eye health.

Information Booster:
● Carotene is responsible for the yellowish color of butter and ghee as well.
● It is a source of Vitamin A, crucial for vision and immune function.
● Other pigments like riboflavin contribute to milk's nutritional properties.
● Cow breeds like Jersey and Guernsey produce milk richer in carotene.
● Regular milk consumption supports growth and development in children.

Additional Information:

• (A) Riboflavin: A water-soluble vitamin, responsible for milk's nutritional value but not its color.
  
• (D) Xanthophyll: Found in plants but not in significant amounts in milk.