If "banana" is called "apple", "apple" is called "grapes", "grapes" are called "mango", "mango" is called "nuts", and "nuts" are called "watermelon", which of the following is a yellow fruit?

Explanation

This is a renaming puzzle, not a food-science question. A real banana is yellow, and the statement says "banana" is called "apple". Therefore, in the coded language, the yellow fruit is called "Apple". Don't chase the entire naming chain. That is the trap.