With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: John McCain is known for his work to restore diplomatic relations with Vietnam in the 1970s.
text_B: Lucine Amara -LRB- born March 1 , 1925 -RRB- is an American soprano who was largely based at the Metropolitan Opera in New York .. soprano. soprano. Metropolitan Opera. Metropolitan Opera
not_related.