With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Heroin overdoses can be treated with naloxone, otherwise known as narcan.
text_B: The 2010 Ladies Tour of Qatar was the second edition of the Ladies Tour of Qatar cycling stage race .. Ladies Tour of Qatar. Ladies Tour of Qatar. It was rated by the UCI as category 2.1 , and was held between 3 and 5 February 2010 , in Qatar .
not_related.