Task: Text Categorization
Input (English): Question: Iodine is poorly soluble in water ( 0.001M). Therefore, to obtain useful solutions as an analytical reagent it is dissolved in: 
 Options:  <0> 0.1 M potassium nitrate <1> Perchloric acid 0.01 M. <2> Excess of calcium nitrate. <3> Potassium iodide. <4> Hot water.
Output (English): chemistry