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Chromium is widely used in the leather industry , and tannery workers are under constant threat of adverse health effects due to its excessive exposure .
 Chemical: Chromium
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: Chromium 
Answer:
 Chemical: Chromium