23411
Alterations in dietary copper did not amplify or abrogate the hepatic toxicity of PCB126 .
 Chemical: copper; Chemical: PCB126
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: copper, PCB126 
Answer:
 Chemical: copper; Chemical: PCB126