With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Bangalore was controlled by the Maharaja of Mysore.
text_B: NGC 173 is a spiral galaxy located approximately 3.8 million light-years away in the constellation Cetus .. NGC. New General Catalogue. Cetus. Cetus. In the Catalogue of Named Galaxies , it is called Inconspicuus Ceti , or the inconspicuous galaxy .
not_related.