Task: Question Answering
Input (English): Which equation is a balanced chemical equation?  
 (A) 2NaOH + CaBr_{2} -> Ca(OH)_{2} + NaBr (B) NO + Cl_{2} -> NOCl (C) CaCO_{3} -> CaO + 2CO_{2} (D) 2AlCl_{3} + 3Mg -> 3MgCl_{2} + 2Al
Output (English): D