There are two blocks, A and B. Block A has two big blue triangles. Big blue triangle number one is touching the bottom edge of this block. It is below big blue triangle number two. Block B is to the right of block A. It contains a medium blue square, a medium black triangle and a medium yellow triangle. The medium blue square is above the medium black triangle which is to the left of and below the medium yellow triangle. The medium yellow triangle is above and to the right of a medium black square.
What is above the medium black triangle? a medium blue square or a yellow triangle?
medium blue square  yellow triangle  both of them none of them