Sorry it took me so long to answer.
Code:
There are 8 choices for the alternative x-session-manager (providing /usr/bin/x-session-manager).
Selection Path Priority Status
------------------------------------------------------------
0 /usr/bin/gnome-session 50 auto mode
* 1 /usr/bin/gnome-session 50 manual mode
2 /usr/bin/gnome-session-fallback 40 manual mode
3 /usr/bin/lxsession 49 manual mode
4 /usr/bin/openbox-session 40 manual mode
5 /usr/bin/startkde 40 manual mode
6 /usr/bin/startlxde 50 manual mode
7 /usr/bin/startxfce4 50 manual mode
8 /usr/bin/xfce4-session 40 manual mode