Riddle

What is black when it is clean and white when it is dirty?

Choose an answer

A.A chimney
B.A shoe
C.A window
D.A blackboard
Hint: It's a 2-word phrase with 11 letters, starting with "A".

Answer

A blackboard

Why this is the answer

A chalkboard is black when freshly cleaned but looks white and chalky when covered in dust from writing.

This riddle is filed under Hard/Difficult Riddles and rated Easy.