With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: South America contains Spain.
text_B: Tomentum may refer to  :. Tomentum. Tomentum ( anatomy ). Plant trichomes , a covering of closely matted or fine hairs on plant leaves .. Plant trichomes. Trichome#Plant trichomes. Tomentum , short , soft pubescence or a covering of fine , soft hairs .. Tomentum. Tomentum ( anatomy ). pubescence. wiktionary :pubescence. A network of minute blood vessels in the brain .
not_related.