The PPT of that kind of knowledge contest, how can the topic come out first and then click to come out with the correct answer?

It's very simple. Set PPT animation

Select animation in the menu bar at the top of PPT, and then select the animation form you like.

Or click on the correct answer that you want to display later in your PPT, and you will see a custom animation on the right side of PPT. Select Add Effect. In the same way,

When previewing and playing, the topic will appear first, and the answer will appear again with a mouse click ~

I hope it can help you ~