There are two blocks. We call them A and B. Block A contains one big black square. Above block A we have block B which has a big blue circle, a medium blue triangle and a medium black triangle. It also contains a small yellow triangle. The big blue circle is touching the bottom edge of this block. The medium blue triangle is above the medium black triangle. It is to the left of the small yellow triangle. Below the small yellow triangle there is the medium black triangle. It is touching the bottom edge of this block. The big blue circle is below the medium blue triangle and the small yellow triangle.
What is above the big black thing? a medium black triangle or a medium blue triangle?
medium black triangle  medium blue triangle  both of them none of them