With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Opera incorporates elements of spoken theatre.
text_B: The 1998 Kroger St. Jude International was a men 's tennis tournament played on indoor Hard courts in Memphis , United States , that was part of the International Series Gold of the 1998 ATP Tour .. International Series Gold. ATP International Series Gold. Hard. Hardcourt. Memphis. Memphis, Tennessee. United States. United States. tennis. tennis. indoor. Tennis court#Indoor courts. Hard courts. Hardcourt. 1998 ATP Tour. 1998 ATP Tour. It was the 28th edition of the tournament and was held 16 February -- 22 February 1998 .
not_related.