There are three blocks, A, B and C. Block A contains one medium yellow circle and one big yellow square. A medium yellow square is below a small yellow triangle which is to the left of and near to the big yellow square. It is below and near to the medium yellow circle. Then, there is block B with one medium yellow triangle, a big black triangle and one big blue triangle in it. The big blue triangle is to the left of a big black square. The big black square is touching the right edge of this block. The medium yellow triangle is near to, above and to the left of the big black square. It is above the big black triangle. Finally, above block B we have block C. It is above block A. It has one big black square, one big blue triangle and one small black circle. One big yellow square is also in this block. The big black square is to the right of the big blue triangle and the big yellow square. To the right of the small black circle is the big blue triangle. It is above the big yellow square.
What is above the small yellow triangle? a big yellow square or a medium yellow square?
big yellow square  medium yellow square  both of them none of them