46.White to move

In the position above Black has made a blunder by moving the knight to f6.The question is

a)From your point of view what is the best continuation for White to take an advantage from Black error?


Thanks again to Eugene for sharing your thought to solve problem 45 by 1. Nxg6 fxg6 2. Re7+ Rf7 3. Rxa7 Rxa7 4. Qd4+ Kg8 5. Qxa7 and 1.Nxg6 is the key move. Other variation that playable 1.Nxg6 Bxf2+ 2.Rxf2 fxg6 3.Qe7+ Qxe7 4.Rxe7+ Kg8 5.Bxg6 but in the end the position favor white.