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However , the contribution of the two TCE metabolites , dichloroacetate ( DCA ) and trichloroacetate ( TCA ) to the toxicity of TCE , remains unclear .
 Chemical: TCE; Chemical: dichloroacetate; Chemical: DCA; Chemical: trichloroacetate; Chemical: TCA; Chemical: TCE
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: TCE; Chemical: dichloroacetate; Chemical: DCA; Chemical: trichloroacetate; Chemical: TCA; Chemical: TCE