With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Chris Pine appeared in a 2010 American disaster thriller film.
text_B: Common name  : Mexican small-headed rattlesnake. Crotalus intermedius is a venomous pit viper species found in central and southern Mexico .. venomous. venomous snake. pit viper. Crotalinae. species. species. Mexico. Mexico. Three subspecies are currently recognized , including the nominate subspecies described here .. subspecies. subspecies. nominate subspecies. nominate subspecies
not_related.