14008
While manganese ( Mn ) is essential for proper central nervous system ( CNS ) development , excessive Mn exposure may lead to neurotoxicity .
 Chemical: manganese; Chemical: Mn; Chemical: Mn
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: manganese; Chemical: Mn; Chemical: Mn