TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: AT RANDOM 
Clue: A cross between tennis & ping-pong, this sport was named for a dog, not a gherkin

SOLUTION: pickle ball

PROBLEM: Category: ROCK AROUND AMERICA 
Clue: The house where this Janis Joplin band was formed once stood at 1090 Page Street in San Francisco

SOLUTION: big brother and the holding company

PROBLEM: Category: MILITARY HISTORY 
Clue: A participant in WWI's First Battle of the Marne was the BEF, short for this

SOLUTION:
british expeditionary force