With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Iron Man is a city.
text_B: Chu Chin-peng is a politician in the Republic of China .. Republic of China. Republic of China. He was the Minister of the Research , Development and Evaluation Commission of the Executive Yuan from 2009 to 2012 .. Executive Yuan. Executive Yuan
not_related.