Observing the previous rounds, the opponent showed variation but there might be a slight pattern. Round 1: paper, round 2: rock, round 3: scissors, round 4: paper. Given that paper appeared twice, it's possible the opponent might try to repeat a move such as rock that paper can beat. Alternatively, if the opponent suspects a pattern, they might attempt rock. To cover that possibility, I'll choose paper because paper beats rock. Thus, I'll select paper for round 5.