With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Raphael Bob-Waksberg is an American citizen.
text_B: Cirsium nuttallii , called Nuttall 's thistle , is a North American species of plants in the thistle tribe within the sunflower family .. Cirsium. Cirsium. thistle tribe. Cynareae. sunflower family. Asteraceae. The species is native to the coastal plain of the southeastern and south-central United States , from eastern Texas to southeastern Virginia .. United States. United States. Texas. Texas. Virginia. Virginia. Cirsium nuttallii is a biennial or perennial herb up to 350 cm -LRB- almost 12 feet -RRB- tall , with a large taproot .. Cirsium. Cirsium. biennial. Biennial plant. perennial. Perennial plant. taproot. taproot. Leaves are up to 60 cm -LRB- 24 inches -RRB- long with thin , green on the upper side but gray to white on the underside because of numerous woolly hairs ; spines along the edges of the leaves .. There are a few flower heads , each head with white , pink , purple or lavender disc florets but no ray florets .. flower heads. flower heads. lavender. Lavender ( color ). ray florets. ray florets
not_related.