1...Nf6, per databases and the following video.
The strongest reply to d4
https://www.youtube.com/watch?v=zOtapT2M2dQ
queen pawn opening
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Maybe consult:
Grandmaster Repertoire 11: Beating 1 d4 Sidelines by Boris Avrukh (2012)
https://web.archive.org/web/20140627001415/http://www.chesscafe.com/text/hansen164.pdf
Nov 20, 2016
0
#4
Black has lots of fully playable replies to 1. d4
He can play 1. ... d5 or 1. ... Nf6 or 1. ... e6 or 1. ... d6 or 1. ... c5 or 1. ... g6, any of which will give him a perfectly playable game if followed up correctly.
I'm sure there are other playable first-move replies as well (such as 1. ... c6), but they might require more accurate play to avoid ending up in a bad position.
best way black can defend queen pawn opening for winning