Read this and answer the question. If the question is unanswerable, say "unanswerable".

Although racial and colonial definitions of the Middle East are no longer considered ideologically sound, the sentiment of unity persists. For much, but by no means all, of the Middle East, the predominance of Islam lends some unity, as does the transient accident of geographical continuity. Otherwise there is but little basis except for history and convention to lump together peoples of multiple, often unrelated languages, governments, loyalties and customs.

What sentiment persists even though racial and colonial definitions of the Middle East are no longer ideologically sound?
sentiment of unity