TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Joseph Addison and Richard Steele founded (in 1711), and Boris Johnson edited, which British magazine?

SOLUTION: boris johnson

PROBLEM: The headquarters building of which government agency is known as 'The Doughnut' due to its shape?

SOLUTION: the doughnut

PROBLEM: Who was Captain America's sidekick during World War II?

SOLUTION:
captain america