22154
When both chemicals were combined , synergism was observed after 96 h of exposure to copper and Forum .
 Chemical: copper; Chemical: Forum
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, Forum 
Answer:
 Chemical: copper; Chemical: Forum