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It's most likely a trained decision tree with binary output.

Trained in what way? I'd have thought this was just a hard-coded DT, it's multiple-choice questions all the way down

https://en.wikipedia.org/wiki/Decision_tree_learning

Maybe it is to bring about it's simplicity, or a sarcastic tounge-in-cheek jab at it. The word "algorithm" doesen't really distinguish it's complexity in any way. It's just a sequence of steps.

https://en.wikipedia.org/wiki/Decision_tree