Here you are not required to answer one .. but several answers are all correct and the first answered by other people .. Think logic and take into account your intuition and how society thinks ..
Take the example: "What is building materials?" Cement? Iron? Wood? .. I think you understand the story .. Please try it.

Some other questions:
its color is red..
The first thing you do when you wake up ..
What thing might call you to wake up on the second at night ..
Countries involved in World War II ..

In addition to multiple levels of pictures you answer based on what came to mind when you see them ..