If 'blue means green', 'green means white', 'white means yellow', 'yellow means black', 'black means red ' and 'red means brown', then what is the colour of milk?
Answer: D
Asked: the colour of milk in this code.
Rule: "X means Y" says the word X is used for the real colour Y. To name a real colour, find the word that "means" it.
Milk is actually white.
The clue that ends in white is "green means white". So white is called green.
Common trap: reading "white means yellow" and answering Yellow. That clue tells you what the word "white" stands for. Here we need the word that stands for white.
Answer: Green