1555
Our study determined whether there was a significant dose - dependent correlation between increasing Hg exposure from dental amalgams and GST - alpha and GST - pi as biomarkers of kidney integrity .
 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: Hg