With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sociology is the study of the origins of society.
text_B: The 1979 Denver Broncos season was the team 's 20th year in professional football and its 10th with the National Football League -LRB- NFL -RRB- .. 1979 NFL season. Denver Broncos. Denver Broncos. National Football League. National Football League
not_related.