Based on the previous rounds, the opponent has chosen rock and paper, but not scissors yet. Considering the rules, if the opponent chooses rock, paper would be a good choice to beat it. However, if the opponent chooses scissors, rock would lose. Given the recent choice of paper in round 5, I'm going to choose scissors to potentially beat paper if the opponent chooses it again, or to encourage the opponent to choose rock, setting up for a potential win in the next round with paper.