With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Marlon Brando played Emiliano Zapata and he was American.
text_B: The World Challenge is a competition that was first hosted in 2005 by BBC and sponsored by Newsweek and Shell .. BBC. BBC. Newsweek. Newsweek. Shell. Shell Oil Company. It accepts projects from around the world that deal with social , environmental and community issues and uses business methods to try to improve upon those issues in the world .. social. society. environmental. Social environment. community. community. business. business
not_related.