2803
Human serum butyrylcholinesterase ( HuBChE ) is currently the most suitable bioscavenger for the prophylaxis of highly toxic organophosphate ( OP ) nerve agents .
 Chemical: organophosphate
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