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Single - walled carbon nanotubes ( SWCNTs ) have extensive potential industrial applications due to their unique physical and chemical properties ; yet this also increases the chance of human and environment exposure to SWCNTs .
 Chemical: carbon
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: carbon 
Answer:
 Chemical: carbon