22820
Of the 927 infants , 50 % had a high level Zn ( >= 794 . 3 mu g / L ) and 8 . 6 % had a high level Se ( >= 100 mu g / L ) .
 Chemical: Zn; Chemical: Se
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: Zn; Chemical: Se