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In the present study , we investigated whether acute exposure to organophosphate ( OP ) chlorpyrifos ( CPF ) is related to long - term lack of inhibitory control ; we also examined the possible neurochemical basis of this association .
 Chemical: organophosphate; Chemical: chlorpyrifos; Chemical: CPF
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: organophosphate; Chemical: chlorpyrifos; Chemical: CPF