With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: From March 4, 1897 until his death, William McKinley served as a US president.
text_B: Aaron Lightner is a fictional character created by Anne Rice and featured primarily in The Witching Hour , Lasher , Taltos -LRB- novel -RRB- , Merrick -LRB- novel -RRB- and Queen of the Damned .. Anne Rice. Anne Rice. The Witching Hour. The Witching Hour ( novel ). Lasher. Lasher. Queen of the Damned. Queen of the Damned. Lightner was one of the oldest and most knowledgeable members of a secret order of historians and scholars called the Talamasca Caste .. Talamasca Caste. Talamasca Caste
not_related.