With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The main character of Memento is looking for the persons who killed his wife.
text_B: Rhododendron glanduliferum is a rhododendron species native to northeastern Yunnan , China , where it grows at altitudes of 2300 -- 2400 meters .. Rhododendron. Rhododendron. rhododendron. rhododendron. species. species. Yunnan. Yunnan. China. China. It is an evergreen shrub that typically grows to 4 meters in height , with leathery leaves that are oblong-lanceolate to oblanceolate , and 10 -- 19 × 3.8 -- 4.5 cm in size .. shrub. shrub. Flowers are white .
not_related.