There are three blocks, A, B and C. Block A is below C and block C is above B. Block A contains a big yellow triangle. It also contains a medium yellow square. A small blue circle is also in this block. Near to the big yellow triangle is the medium yellow square. The big yellow triangle is below the small blue circle. To the left of the small blue circle there is the medium yellow square. Block B contains one big black circle. Below a small black circle is the big black circle. Block C has a medium black triangle and a small black triangle. The medium black triangle is touching the bottom edge of this block. The small black triangle is below and to the left of a big blue triangle. Below the big blue triangle there is the medium black triangle. It is to the right of the small black triangle.
What is above the medium yellow object? a big yellow triangle or a big blue triangle?
big yellow triangle  big blue triangle  both of them none of them