With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Gustave Eiffel focused on research in meteorology.
text_B: Svetoslav Emilov Vitkov is a Bulgarian singer , karate instructor and songwriter , best known for his work with Hipodil .. Hipodil. Hipodil. In 2013 he founded the political party People 's Voice .
not_related.