With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: One of the American manufacturers is Detroit Diesel.
text_B: Aristolochia cucurbitoides is a species of plant in the Aristolochiaceae family .. plant. plant. Aristolochiaceae. Aristolochiaceae. It is endemic to China .. endemic. Endemism. China. China
not_related.