Context: American cheese, Cheez Whiz, and provolone are the most commonly used cheeses or cheese products put on to the Philly cheesesteak.\n\nQuestion: what kinda cheese is on a philly cheesesteak?
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The relevant information to answer the above question is: American cheese, Cheez Whiz, and provolone are the most commonly used cheeses or cheese products put on to the Philly cheesesteak.
So, the answer is American cheese.
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