26883
In the prescription , significant level of realgar ( As2S2 ) as a potentially toxic element is contained .
 Chemical: realgar; Chemical: As2S2
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: realgar, As2S2 
Answer:
 Chemical: realgar; Chemical: As2S2