10225
The freshwater pulmonate snail , Lymnaea stagnalis , is the most sensitive freshwater organism tested to date for several metals ( Co , Cu , Pb , Ni ) based on 28 d early life - stage ( ELS ) tests in which growth was the most sensitive endpoint .
 Chemical: Co; Chemical: Cu; Chemical: Pb; Chemical: Ni
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: Co, Cu, Pb, Ni 
Answer:
 Chemical: Co; Chemical: Cu; Chemical: Pb; Chemical: Ni