3985
Arsenic remains a top environmental concern in the United States as well as worldwide because of its global existence and serious health impacts .
 Chemical: Arsenic
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: Arsenic 
Answer:
 Chemical: Arsenic