When you have choices, are you always right?
Solution 1:
No, you're not always right. For example, I got the twin sisters wrong. As far as I remember, choosing the right twin is a little tricky, the evidence doesn't clearly indicate which one is the cultist. But for the two kings of Sparta you gather clues from other cultists that help you decide which king is the cultist (in fact, once you have all the clues the sage can be unveiled in the cultist menu). I think depending on your earlier choices you may not get all the necessary clues and then you have to guess, and you may get it wrong as well.