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Nitric oxide is implicated in methamphetamine ( METH ) - induced neurotoxicity ; however , the source of the nitric oxide has not been identified .
 Chemical: Nitric oxide; Chemical: methamphetamine; Chemical: METH; Chemical: nitric oxide
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: Nitric oxide; Chemical: methamphetamine; Chemical: METH; Chemical: nitric oxide