With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Stagira is an ancient city.
text_B: George Ernest Hamilton CE -LRB- ca. 1800 -- 8 October 1872 -RRB- was a British civil engineer who played a leading role in development of the Colony of South Australia .. Civil engineer. South Australia. South Australia
not_related.