How do you delete a mystery object? If you encounter an unexpected object in your blender file, how would you delete it? 

For example, there is a mysterious egg shape object that I didn't notice until now because it was covered by a plane. 



I can't select the object since it appears to be part of another object. 
I can't press P to try and separate the object by selection because blender warns 'no object selected'. 

I have no idea where this shape came from, nor how to get rid of it. 

Blender File
It's part of the ring object. The ring has a cube in it, which is being subsurfed and distorted by the modifiers, resulting in the "egg" object.

Select the ring ( RMB), enter edit mode (&#8633; Tab) and delete the cube at the top.