With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: One of the world's largest football stadiums is in Rio de Janeiro.
text_B: The Bellanca J-300 was a high wing cabin monoplane used for several trans-atlantic attempts , including a successful 1934 crossing by the Adamowicz brothers .. monoplane. monoplane. Adamowicz brothers. Adamowicz brothers
not_related.