With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Linda McCartney refused to step foot into a doctor's office.
text_B: The Supermarine Seagull was a British amphibious , military flying boat and the last to be built by the Supermarine company .. amphibious. Amphibious aircraft. flying boat. flying boat. Supermarine. Supermarine. Design started during the Second World War but it did not fly until three years after the war had ended and the project was cancelled without it being adopted for service .. Second World War. World War II
not_related.