With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Vietnam War started in the 20th century.
text_B: Tetradium ruticarpum is a tree that comes from China and Korea .. Tetradium. Tetradium. It was previously classified in the genus Euodia as Euodia ruticarpa .. Euodia. Euodia ( genus ). The fruit is usually used , denoted sometimes as fructus .. It has a strong bitter taste , and is used in traditional Chinese medicine -LRB- TCM -RRB- and is a recognized herb in Kampo .. Kampo. Kampo. Both the former genus name and the species name are often misspelled , and the plant usually appears in sources dealing with traditional Chinese medicine as `` Evodia -LRB- e -RRB- rutaecarpa '' .
not_related.