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Lead ( Pb ( 2 + ) ) is a naturally occurring systemic toxicant heavy metal that affects several organs in the body including the kidneys , liver , and central nervous system .
 Chemical: Pb ( 2 + )
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 ( 2 + ) 
Answer:
 Chemical: Pb ( 2 + )