There are three blocks, A, B and C. Blocks B and A are above C. Block A has one medium yellow square. Block B contains a small black triangle and one small blue circle. A medium blue square is touching the bottom edge of this block. This object is below the small black triangle and the small blue circle. And block C contains a medium black square and one medium blue triangle. The medium black square is near to the medium blue triangle.
What is above the medium black square? a small black triangle or a yellow thing?
small black triangle  yellow thing both of them none of them