Task: Text Categorization
Input (English): Question: Regal water dissolves gold because of its two components: 
 Options:  <0> Sulfuric acid acts as an oxidant and hydrochloric acid forms a soluble chlorinated complex of Au3 +. <1> Hydrochloric acid increases the oxidizing power of nitric acid. <2> Nitric acid acts as an oxidant and hydrochloric acid forms a soluble chlorine complex of Au3 +. <3> Hydrochloric acid acts as an oxidant and nitric acid forms a soluble complex of Au3 +. <4> Nitric acid acts as an oxidant and hydrochloric acid forms a soluble chlorinated complex of Au2 +.
Output (English): chemistry