3088
At not - cytotoxic concentrations ( cell viability higher of 80 % , as assessed by MTT reduction assay ) , all contact sensitizers , including pre - pro - haptens , induced a dose - related increase in IL - 18 , whereas both irritants , with the exception of sulfamic acid , and respiratory allergens failed .
 Chemical: MTT; Chemical: sulfamic acid
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: MTT; Chemical: sulfamic acid