With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Richard Gere starred in a crime film.
text_B: The National Numismatic Collection is the national coin cabinet of the United States .. cabinet. Cabinet ( room ). United States. United States. The collection is part of the Smithsonian Institution 's National Museum of American History .. Smithsonian Institution. Smithsonian Institution. National Museum of American History. National Museum of American History
not_related.