17718
The proposed method is a useful tool for examining the speciation of Hg in fish muscle and liver , and by extension , potentially other tissues and environmental media .
 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: Hg 
Answer:
 Chemical: Hg