If you clap just one hand in a forest and nobody is around to hear it does it make a sound?
Some questions aren't mean to be answered. They don't even have a correct answer. The goal is to make you think. Question and doubt everything that's real. The path to the enlightenment as the Zen says about these koans.
First level of teaching is stating the facts. You don't need to think, or question anything. Just assume what's given. Next, some examples can be provided. The information can be applied to similar scenarios extending it's usefulness and encourage some creative thinking.
Making the student really think about the subject is art of asking the right questions that lead them to the correct answer. Finding the solution on your own is much more rewarding than just listening to solutions made by others.
But to make one really think, that requires something more. Something that doesn't have a correct answer. Something that can set the mind free to come up with its own conclusions. In the end, it's not about the answer, but the journey that gets you there.