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Valproic acid ( VPA ) and methylmercury ( MeHg ) were used as positive control compounds to address the following fundamental questions : ( 1 ) Does transcriptome analysis allow discrimination of the two compounds ?
 Chemical: Valproic acid; Chemical: VPA; Chemical: methylmercury; Chemical: MeHg
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Valproic acid; Chemical: VPA; Chemical: methylmercury; Chemical: MeHg