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Bax / Bcl - 2 mRNA expression in the high selenium group was also highly elevated ( P < 0 . 05 ) .
 Chemical: selenium
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: selenium 
Answer:
 Chemical: selenium