Based on the opponent's previous moves—rock in rounds 1 and 4 and paper in rounds 2 and 3—it appears that the opponent is only using rock and paper. Given this, choosing paper is a risk-averse strategy: if the opponent plays rock (which they did in rounds 1 and 4), paper wins; if they play paper (rounds 2 and 3), it's a tie rather than a loss (which is what would happen if I chose scissors against rock). With the score tied at 2-2 and wanting to avoid unnecessary risk, paper provides the most balanced option for round 5.