With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Citalopram is of the selective serotonin reuptake inhibitor class.
text_B: The TV Set is a 2006 comedy-drama film about an idealistic writer attempting to bring his vision for a TV show to fruition on the small screen .. comedy-drama film. comedy-drama film
not_related.