Visual IQ puzzle (MENSA Denmark, difficulty 3)
Correct answer: F
Explanation: Each figure is made of a gridm where each tile containa shape that can be a circle, a square or a triangle. For each row, consider the first two columns of the first and  the last two columns of the second figure starting from the left. The first two rows of the first figure influence the last two rows of the second figure: a square from the first two rows becomes a circle in the last two rows, a circle in the first two rows becomes a triangle in the last two rows,  a triangle from the first two rows becomes a circle in the last two rows. The same rules apply for the first and second columns of the figures in the middle and the last two columns of the figures on the right.