With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Justin Timberlake is a Russian singer-songwriter.
text_B: Antonio Cicco da Pontecorvo -LRB- died 21 Apr 1477 -RRB- was a Roman Catholic prelate who served as Bishop of Caserta -LRB- 1459-1477 -RRB- .. Caserta. Caserta. Bishop of Caserta. Bishop of Caserta
not_related.