What is the climax of M. Butterfly?

The climax of the play M. Butterfly
occurs in Act 3 Scene 2 when Gallimard confronts Song after Song has stripped
in court and revealed that he is in fact a man.  In the previous scene, Song has told
the court how he was able to fool Gallimard for so long into believing that he was a
man; Song also reveals all the secret information that he was able to get from
Gallimard.  In Scene 2, Gallimard confronts Song--he is angry because he says that he
truly loved his Butterfly and he was betrayed.  Song tries to coax Gallimard, but now
that he is just a man, Song no longer has any power of Gallimard.  Gallimard banishes
Song from his life and comes to the realization that he is no longer like Pinkerton from
the Madama Butterfly opera; he now relates to Cio-cio san who gave
her life to love her partner.