There are three blocks. We call them A, B and C. Block A contains a small blue square. Above block A there is block B which contains a small yellow triangle, one big black circle and one medium yellow circle. Below the medium yellow circle and the big black circle is the small yellow triangle. Finally, we have block C above block A. It has one small blue triangle. This block also contains a medium yellow triangle. Far from and above the small blue triangle is the medium yellow triangle.
What is above the square? a medium yellow circle or a big black circle?
medium yellow circle  big black circle  both of them none of them