With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Brad Pitt appeared in a campaign ad.
text_B: This article provides information on candidates who stood for the 1955 Tasmanian state election , held on 19 February 1955 .. 1955 Tasmanian state election. Tasmanian state election, 1955
not_related.