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: WE HAVE THE TECHNOLOGY 
Clue: Smile!  In 1888 this American introduced the first simple consumer camera to use roll film

SOLUTION: eastman

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: WHAT COLOR IS GREEN? 
Clue: Lincoln Green is also called this green, where you might see it were it not for the trees

SOLUTION:
a forest