There are three blocks, A, B and C. Block C is above block B and to the right of block A. Block A contains a small yellow square. Block B contains two small black circles. Below small black circle number two and a small blue square there is small black circle number one. This block also has one medium black triangle. It is below the small blue square which is to the left of small black circle number two. And block C has a medium black square and a small yellow circle. Above and to the left of the small yellow circle is the medium black square.
What is below the medium black square? a small black circle or a small yellow square?
small black circle  small yellow square  both of them none of them