With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Jing Tian refused to have an acting career.
text_B: Starfighter is the shortened name of the Lockheed F-104 Starfighter , a combat aircraft of the U.S. Air Force .. Lockheed F-104 Starfighter. Lockheed F-104 Starfighter. Starfighter , star fighter or starfighters may also refer to  :
not_related.