3099
Human consumers in Kabwe could be exposed to Pb and Cd in free - range chickens .
 Chemical: Pb; Chemical: Cd
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: Pb, Cd 
Answer:
 Chemical: Pb; Chemical: Cd