Which one of the does not be long with the group?

ان میں سے کون سا گروپ کے ساتھ طویل نہیں ہے؟

Philanthropinum

Didasealeum

Palaestra

Ephebos

The term "Philanthropinum" does not belong to the group.
The others - Didasealeum, Palaestra, and Ephebos - are all related to aspects of ancient Greek education or training.