With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Leonardo da Vinci was an engineer.
text_B: Meliton Perez del Camino -LRB- 1772 -- 1845 -RRB- was a squad leader of the Royal Spanish Navy .. Royal Spanish Navy. Royal Spanish Navy. Spanish. Spanish people
not_related.