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AstralLein, I'm currently working on a small guide about scripts, and I'll post it in a few days. It will describe this in more detail.
In short, TalkBox passes 2 parameters to the callback function: the number of the responding player and the number of the selected answer. You don't need to write all the additional text; in "Path of the Hero," I only filled in the title (character name), icon, main text, and text for the answers.