There are three blocks, A, B and C. Block A has one medium black circle. Below block A is block B which has a big black circle and a big blue triangle. The big black circle is touching the top edge of this block. This object is near to and above the big blue triangle. Below block B there is block C which contains a medium yellow triangle, one big blue circle and one medium yellow square. Below, to the left of and near to the medium yellow square there is the medium yellow triangle. To the left of the medium yellow square there is the big blue circle.
What is above the medium yellow triangle? a medium black circle or a big blue circle?
medium black circle  big blue circle  both of them none of them