With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Demi Lovato is a singer songwriter of R&B music.
text_B: Christopher Rees -LRB- born 2 May 1973 , Llanelli , South Wales , UK -RRB- is a musician , singer-songwriter , music producer .. Llanelli. Llanelli
not_related.