Yellow

Riddle: There's a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What color are the stairs?

Answer: There aren’t any—it’s a one-story house.

Source: https://www.riddles.com/9641

There's a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What color are the stairs? — Yellow by GrizzlyBearBrown v1.

Riddle: There's a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What color are the stairs? Answer: There aren’t any—it’s a one-story house. — by GrizzlyBearBrown v2.