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.

Category: BEHIND THE SCENES AT THE 2008 OLYMPICS 
Clue: A journalist for ITN was detained & manhandled for covering a "pro-" this region protest held early in the Olympics
tibet

Category: PREPOSITIONAL PHRASES 
Clue: This Bob Seger song gained commercial popularity in Chevy truck ads
"like a rock"

Category: IN THE HEADLINES 
Clue: In 2005 this former judge was selected by President Bush to head the Dept. of Homeland Security

michael chertoff