Question: Omonoia Square - Omonia Square (Greek: Plateia Omonoias pronounced [platia omonias] Concord Square often simply referred to as Omonia [omonia]) is a central square in Athens. It marks the northern corner of the downtown area defined by the city plans of the 19th century and is one of the city's principal traffic hubs. It is served by Omonia train station. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
Answer:
Building