25221
E . g . , the effects of exposure to silica dust particles have been studied intensely due to the carcinogenicity of crystalline silica .
 Chemical: silica; Chemical: silica
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: silica; Chemical: silica