2181
Thus , the pharmacological therapy rapidly treated the initial signs of poisoning , whilst the bioscavenger provided prolonged protection by neutralising further nerve agent entering the bloodstream and preventing it from reaching the target organs .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None