With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tutsis populate Burundi.
text_B: Big Spring is a census-designated places in Montgomery County , in the U.S. state of Missouri .. census-designated places. census-designated places. Montgomery County. Montgomery County, Missouri. U.S. state. U.S. state. Missouri. Missouri
not_related.