With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Egypt is a member of the Organisation of Islamic Cooperation.
text_B: Castana may refer to a number of towns  :. Castana , Iowa , United States. Castana , Lombardy , Italy. See also. Chastana , the Western Satrap king. Chastana. Chastana
not_related.