Task: Question Answering
Input (English): Suppose 20 g of liquid hydrogen peroxide is heated so it completely breaks down into liquid water and oxygen gas. Which best describes the total mass of the water and oxygen that was produced?  
 (A) more than 20 g because of the addition of heat (B) more than 20 g because there are now two substances (C) less than 20 g because oxygen gas is very light (D) 20 g because no matter is added or removed
Output (English): D