With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: A British-born Australian actor is featured prominently in Terminator Salvation.
text_B: The rock pigeon is the Euro-American species Columba livia .. rock pigeon. rock pigeon. Rock pigeon also may refer to  :. Petrophassa , Australian genus. Petrophassa. Petrophassa. Speckled pigeon , African species Columba guinea. Speckled pigeon. Speckled pigeon. Category  : Animal common name disambiguation pages
not_related.