21711
It was observed that Pb , Cd and Ni concentrations varied from both plant to plant and in same plants at different experimental sites .
 Chemical: Pb; Chemical: Cd; Chemical: Ni
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: Pb; Chemical: Cd; Chemical: Ni