With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Christina Aguilera is not a music artist.
text_B: Jamie Delgado and Jonathan Marray were the defending champions of the 2012 Aegon Pro-Series but they decided not to participate together this year .. Jamie Delgado. Jamie Delgado. Jonathan Marray. Jonathan Marray. Delgado played alongside Ken Skupski , while Marray was involved in the 2012 ATP World Tour Finals .. Ken Skupski. Ken Skupski. 2012 ATP World Tour Finals. 2012 ATP World Tour Finals. James Cerretani and Adil Shamasdin won the final 6 -- 4 , 7 -- 5 against Purav Raja and Divij Sharan .. James Cerretani. James Cerretani. Adil Shamasdin. Adil Shamasdin. Purav Raja. Purav Raja. Divij Sharan. Divij Sharan
not_related.