Task: Text Categorization
Input (English): Question: The polymerase chain reaction (PCR) encompasses three processes. Select sequence order: 
 Options:  <0> Extension → Fusion → Denaturation. <1> Fusion → Denaturing → Extension. <2> Denaturing → Fusion → Extension. <3> Denaturing → Extension → Fusion. <4> Extension → Denaturation → Fusion.
Output (English): chemistry