Correct Answer: Casein, lactose

Solution : The correct answer is Casein, Lactose .

Lactose is formed by one molecule of glucose and one molecule of galactose. It is a disaccharide of milk sugar. While casein is a milk protein. It is also found in other milk products like yoghurt, cheese, infant milk etc. It gives the milk a white colour. It is an essential protein required for the development of the human body, especially for the strengthening of bones.