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: THE BIG BANGLADESH 
Clue: The green on the flag of Bangladesh represents its lush vegetation; the red circle in the middle is this

SOLUTION: the sun

PROBLEM: Category: FOOD 
Clue: This salad dressing is actually American; its name may come from the fact that it once contained caviar

SOLUTION: russian dressing

PROBLEM: Category: READ THE BOOK, SAW THE FILM 
Clue: For Bogie's screen role, this book's Charlie Allnutt was changed from a Cockney to a Canadian

SOLUTION:
the african queen