With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tokyo is the most populous metropolitan area in the world
text_B: Breaking the Spell may refer to  :. Breaking the Spell -LRB- film -RRB- , 1999 documentary film about 1999 WTO riots. Breaking the Spell  : Religion as a Natural Phenomenon , 2006 book by Daniel Dennett. Breaking the Spell  : My Life as a Rajneeshee and the Long Journey Back to Freedom , 2009 book by Jane Stork
not_related.