With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The longest-lived American fantasy series on the air is Supernatural.
text_B: Terken Khatun also known as Turkan Khatun -LRB- ترکان خاتون , `` the Queen of the Turks '' -RRB- was the Empress of the Khwarazmian Empire by marriage to Shah Ala ad-Din Tekish , and the mother and de facto co-regent of Muhammad II of the Khwarazmian Empire .. Ala ad-Din Tekish. Ala ad-Din Tekish. Muhammad II. Muhammad II of Khwarezm. Khwarazmian Empire. Khwarazmian dynasty. Empress. Queen consort. de facto. de facto
not_related.