Task: Question Answering
Input (English): Sodium bicarbonate (NaHCO_{3}) will neutralize stomach acid (HCl) in a double replacement reaction as follows: NaHCO_{3} + HCl -> NaCl + CO_{2} + \Box What is the product necessary to make this reaction complete?  
 (A) 2HO (B) HO_{2} (C) H_{2}O_{2} (D) H_{2}O
Output (English): D