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A critical need for combating the effects of organophosphate ( OP ) anticholinesterases , such as nerve agents , is the current lack of an effective oxime reactivator which can penetrate the blood - brain barrier ( BBB ) , and therefore reactivate inhibited acetylcholinesterase ( AChE ) in the brain .
 Chemical: organophosphate; Chemical: oxime
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: oxime