With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Ricky Martin has acted in Mexico.
text_B: The 1919 Oxford University by-election was held on 19 -- 24 March 1919 after the incumbent Coalition Conservative MP , Rowland Prothero was created as the first Lord Ernle .. Coalition Conservative. Coalition Conservative. Rowland Prothero. Rowland Prothero, 1st Baron Ernle. Lord Ernle. Baron Ernle. It was retained by the Conservative candidate Prof. Charles Oman .. Prof. Charles Oman. Charles Oman
not_related.