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Selenium ( Se ) and mercury ( Hg ) are prevalent pollutants of industrialized watersheds .
 Chemical: Selenium; Chemical: Se; Chemical: mercury; Chemical: Hg
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: Selenium; Chemical: Se; Chemical: mercury; Chemical: Hg