Opponent has raised 1 out of the past 100 hands, think he's got a big hand?

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
6 players


Stack sizes:
UTG: $9.15
Hero: $28.25
CO: $32.60
Button: $32.70
SB: $25.10
BB: $74.70

Pre-flop: (6 players) Hero is UTG+1 with
UTG folds, Hero calls, CO folds, Button raises to $1.1, 2 folds, Hero calls.

Flop: ($2.55, 2 players)
Hero is all-in $27.15, Button calls.

Turn: ($56.85, 1 player + 1 all-in - Main pot: $56.85)


River: ($56.85, 1 player + 1 all-in - Main pot: $56.85)


Results:
Final pot: $56.85
Button showed Qh Qs
Hero showed 5h 6h