With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Janis Joplin had the Full Tilt Boogie Band as a backing group.
text_B: The Glasgow Cathcart by-election of 1942 was held on 29 April 1942 .. Glasgow Cathcart. Glasgow Cathcart ( UK Parliament constituency ). The by-election was held due to the death of the incumbent Conservative MP , John Train .. John Train. John Train ( politician ). It was won by the Conservative candidate Francis Beattie .. Francis Beattie. Francis Beattie
not_related.