Based on the opponent's previous moves, it appears they are alternating between paper and scissors—particularly, with rounds 1, 2, 3 showing a pattern of paper followed by scissors twice, and rounds 4 and 5 still following this trend. Given that opponent’s most common move has been scissors (in rounds 2, 3, and 5) and if the pattern continues, round 6 is likely to be scissors. Rock beats scissors, so I choose rock for round 6.