In substitution type of questions, some particular objects are assigned code names. Then a question is asked that is to be answered in the code language.
If man is called girl, girl is called woman, woman is called boy, boy is called butler and butler is called rogue, who will serve in a restaurant ?
A 'butler' serves in a restaurant but 'butler' is called 'rogue'.
So a 'rouge' will serve in the restaurant.