With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Gillian Jacobs appeared in the comedy film Life Partners.
text_B: Curtis Bros. & Co. was a leading producer of doors , sashes , blinds and general house finishings between 1866 and 1966 .. The company was the first to produce pre-glazed window units .
not_related.