When he'd answered the question, Indigo was able to get through the door that appeared. He assumed that meant he'd got it right. Though, he hadn't been too concerned with getting it wrong. He was expecting to step into the potions classroom, but unfortunately that did not seem to be what was happening. Instead, he was in a weird, small room that he had never seen before. Definitely not the potions classroom. This room had another door, and on that door there was another piece of parchment with another question on it. He didn't think this question was much more difficult. He was able to quickly eliminate most of the choices. He wasn't sure what the law on polyjuice potion was, but the question was asking what was appropriate, not what was legal. So it seemed to him that the answer was after obtaining informed consent from the person I want to change into. He tapped that one with his wand.