3931
Having considered the carcinogenic risk of inorganic arsenic to humans , it is suggested that efforts should be made to reduce the inorganic arsenic exposure of the Hong Kong population .
 Chemical: arsenic; Chemical: arsenic
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: arsenic; Chemical: arsenic