2172
Potent organophosphorous ( OP ) agents , such as VX , are hazardous by absorption through the skin and are resistant to conventional pharmacological antidotal treatments .
 Chemical: organophosphorous
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: organophosphorous