Benoni Defence.

Not sure what is really the best but U can play 5...Nxd5, 5...Nc6, 5...d6, 5...Bd6 or 5...Be7.

I would say just develop with d6 still and if Bg5 then Nbd7. If not Be6 can be played and the knight can be taken to close the hole. In that case the Bg7 would still have control over the white queenside. What does a database say for the next few moves? My 1982 BCO2 chess book says nothing about it. Be6 is strong though. If he recaptures or she, with the e pawn the game may be drawish because the game is somewhat symmetrical. I have not studied this other than the 5 minutes I took to look over the board. What does the database say?

If white recaptures with the N, then I think black has equalised, because in the M.B., black has one piece too many and swapping off a pair of knights relieves the traffic jam on d7 and black's compact position benefits. If white recaptures with the Q, black gets an easy game due to developing the B hitting the Q.

You don't need a diagram and you'd still need the explanation, which is that removing a pair of knights creates enough space for black to develop and his opening problems are more or less over.