Minecraft Chat Choices?

I would like to receive a message in the Minecraft chat. B. You can choose whether you want a or b, I know that it works but not how. Does anyone know where to find a tutorial or something similar?

Unfortunately, I can't help you. I'm not involved at all in redstone or commands but otherwise check out the yt channel thejocraft or just google something like: click Minecraft answer in chat or something. Maybe you will find something

Have already looked at tjc, but have not found.

So in my experience you just have to go to the control settings then go to multiplayer then hit the t and select your letter.

That's it already.

I meant how to do it yourself.