With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Star Trek had four spin-off radio series.
text_B: Nirmala 's Spice World is a Cooking show from the United States .. This show is also selected for Indian Channel Zindagi & run from 4 May 2015 Mon-Sat 1 :00 pm under the segment `` Fursat Ke Pal '' .. Zindagi. Zindagi ( TV Channel )
not_related.