Question: Why Cheese is yellow, whereas milk is white?

Answer: In fact, milk is not pure white. It contains very small yellow and orange nutrients called beta-carotene. Beta carotene is precursor of Vitamin-A. Many veggies including carrots are excellent source of beta carotene.
Milk is white because it’s liquid. When during cheese making milk becomes condensed, these pigments become concentrated and therefore the color of cheese is yellow. Sometimes during cheese making process they add natural or artificial coloring.