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On the other hand methylmercury ( MeHg ) in fish disturbs the developing central nervous system .
 Chemical: methylmercury; Chemical: MeHg
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: methylmercury, MeHg 
Answer:
 Chemical: methylmercury; Chemical: MeHg