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: ON THE ROCKS 
Clue: This rock formed from hardened lava formed the Hawaiian Islands

SOLUTION: basalt

PROBLEM: Category: PULITZER PRIZES 
Clue: Nicknamed "Black Jack", his memoir "My Experiences in the World War" won the 1932 Pulitzer Prize for History

SOLUTION: general pershing

PROBLEM: Category: TECHIES 
Clue: Eugene Houdry, who invented catalytic cracking of petroleum, made the catalytic converter for this car part

SOLUTION:
the muffler system