With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Michael Caine was in The Prestige.
text_B: The First Army was a formation of the British Army that existed during the First and Second World Wars .. formation. Formation ( military ). British Army. British Army. First. World War I. Despite being a British command , the First Army also included Indian and Portuguese forces during the First World War and American and French units during the Second World War .. First World War. World War I. Second World War. World War II. First. World War I. Indian. British Indian Army#First World War. Portuguese. Portuguese Expeditionary Corps. American. United States Army. French. French Army
not_related.