With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Richard III of England was promoted in the Battle of Bosworth Field.
text_B: The Indice de Precio Selectivo de Acciones -LRB- IPSA -RRB- is a stock market index composed of the 40 stocks with the highest average annual trading volume in the Santiago Stock Exchange -LRB- Bolsa de Comercio de Santiago -RRB- .. stock market index. stock market index. Santiago Stock Exchange. Santiago Stock Exchange. On the last trading day of the year , the index is re-based back to 1000 .. The index has been calculated since 1977 and is revised on a quarterly basis .
not_related.