What is the best move for Black?

ICC 30 5, Internet Chess Club
bahamapapa (1766) vs. fiddler (1813)

1 2 3 4 5 6 7 8 h g f e d c b a +1

(black to move) 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8. Ne2 Nc6 9. Bd2 cxd4 10. cxd4 Nxd4 11. Bc3 e5 12. Bb5+ Nxb5 13. Qa4 Bd7 CHECK!

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