AP ICET 2017 Shift 2 Paper

In a code language. ‘AIR’ is called ‘GREEN'. ‘GREEN' is called ‘BLUE'. ‘BLUE' is called ‘SKY'. ‘SKY' is called ‘YELLOW’, ‘YELLOW’ is called ‘WATER' and ‘WATER’ is called ‘PINK’. Then what is the colour of the clear sky in that code language?