With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: San Francisco's Chinatown is centered on business.
text_B: Christian Sophus Juel -LRB- 25 January 1855 , Randers -- 24 January 1935 , Copenhagen -RRB- was a Danish mathematician , specializing in geometry .. Randers. Randers. Copenhagen. Copenhagen
not_related.