With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Jenni Rivera won an award presented by a network in the 21st century.
text_B: A safety lamp is any of several types of lamp that provides illumination in coal mines and is designed to operate in air that may contain coal dust or gases both of which are potentially flammable or explosive .. lamp. Light fixture. coal dust. coal dust. Until the development of effective electric lamps in the early 1900s miners used flame lamps to provide illumination .. Open flame lamps could ignite flammable gases which collected in mines , causing explosions and so safety lamps were developed to enclose the flame and prevent it from igniting the surrounding atmosphere .. Flame safety lamps have been replaced in mining with sealed explosion-proof electric lights .
not_related.