With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: David Tennant was not in the film Harry Potter and the Goblet of Fire.
text_B: The Bihar legislative assembly election , 2010 was held in six phases over a period of one month starting from 21 October until 20 November in all 243 constituencies of Bihar , India .. constituencies. constituencies. Bihar. Bihar. The election is conducted to elect the government in Bihar for a five-year term .. Bihar. Bihar. The votes were scheduled to be counted on 24 November .
not_related.