There are three blocks, A, B and C. Block C is above A. Block A is to the left of B. Block A has one medium blue square and one medium black triangle. Below the medium black triangle there is the medium blue square. Block B contains one big blue square. A medium yellow triangle is above the big blue square. Block C contains a medium black triangle. To the right of and below the medium black triangle there is a small blue triangle.
What is above the medium blue square? a medium black triangle or a yellow thing?
medium black triangle  yellow thing both of them none of them