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Although mercury ( Hg ) is a well - studied contaminant , knowledge about Hg accumulation in snakes is limited .
 Chemical: mercury; Chemical: Hg; 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: mercury, Hg, Hg 
Answer:
 Chemical: mercury; Chemical: Hg; Chemical: Hg