There are two blocks. We call them A and B. Block A contains a medium blue square. Block B is to the left of block A. It contains a medium black triangle, one medium yellow triangle and a small yellow triangle. A big yellow square is to the left of, near to and above the medium yellow triangle which is to the right of and below the small yellow triangle.
What is to the left of the medium square? a medium yellow triangle or a big yellow square?
medium yellow triangle  big yellow square  both of them none of them