With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Aaron Carter's middle name is Jeff.
text_B: The 9th West Virginia Volunteer Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War .. Union. Union ( American Civil War ). Infantry. Infantry. infantry. infantry. regiment. regiment. Union Army. Union Army. American Civil War. American Civil War
not_related.