With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Boston University has multiple schools.
text_B: Stone structures , or `` megaliths '' , have been erected by humanity for thousands of years .. Many of these structures were built around the same time , the 3rd millennium BC .. Some of the better-known ones  :. Easter Island. Easter Island. Easter Island. Egyptian Pyramids. Egyptian Pyramids. Egyptian Pyramids. Medicine wheels. Stone circle. Stone circle. Stone circle. Stone circle -LRB- Iron Age -RRB-. Stone circle. Stone circle. Stonehenge. Stonehenge. Stonehenge. Stone ship. Stone ship. Stone ship. See also  :. Petroforms. Petroforms. Petroforms. Rock Art. Rock Art. Rock Art. Inukshuk. Inukshuk. Inukshuk. Category  : Megalithic monuments
not_related.