With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: San Francisco is the headquarters of multiple retail companies.
text_B: George MacDonald is a former teacher and Canadian politician .. Canadian. Canada. MacDonald has a long history in municipal politics in his home province of Prince Edward Island .. Prince Edward Island. Prince Edward Island. He served as a councillor for the city of Charlottetown through the 1980s and 1990s before being elected as the 44th mayor in 1997 .. councillor. councillor. Charlottetown. Charlottetown. mayor. mayor. He served in that position for two terms until deciding not to run again in 2003 .. MacDonald was selected as the PC candidate for the provincial electoral district of Charlottetown-Rochford Square in the 2003 PEI general election and lost to Liberal leader Robert Ghiz .. Charlottetown. Charlottetown. Progressive Conservative Party of Prince Edward Island. 2003 PEI general election. Prince Edward Island general election, 2003. Liberal. Liberal Party of Prince Edward Island. Robert Ghiz. Robert Ghiz
not_related.