[Fechado] Limped pot, 2 pares baixos flop, AA no board

Hand converted with online PokerStrategy.com hand converter:

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$0.01/$0.02 No-Limit Hold'em (10 handed)

Known players:
[tg]BB (Hero)$5.14:///////;UTG$0.78:///////;UTG1$4.92:///////;UTG2$0.95:///////;MP1$5.00:///////;MP2$1.14:///////;MP3$10.67:///////;CO$1.00:///////;BU$1.97:///////;SB$5.12:///////;[/tg]

Preflop: Hero is BB with 7:d, T:s.
5 folds, MP3 calls $0.02, 3 folds, Hero checks.

Flop: ($0.05) T:h, 7:c, 2:h (2 players)
Hero bets $0.06, MP3 calls $0.06.

Turn: ($0.17) A:d (2 players)
Hero bets $0.14, MP3 calls $0.14.

River: ($0.45) A:h (2 players)
Hero checks, MP3 bets $0.22, Hero folds, MP3 gets uncalled bet back.

Final Pot: $0.45.

Qual a ação correta no river?