2552
Turtles are useful for studying bioaccumulative pollutants such as mercury ( Hg ) because they have long life spans and feed at trophic levels that result in high exposure to anthropogenic chemicals .
 Chemical: mercury; Chemical: Hg
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: mercury, Hg 
Answer:
 Chemical: mercury; Chemical: Hg