3634
At 48 h , the fish were sacrificed for Se and Hg tissue concentration and distribution .
 Chemical: Se; Chemical: Hg
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: Se, Hg 
Answer:
 Chemical: Se; Chemical: Hg