20134
OBJECTIVES : This study aims to compare the magnitude , persistence and spatial distribution of locomotor sensitisation produced by repeated doses of nicotine , aqueous tobacco particulate matter ( TPM ) and a positive methamphetamine control .
 Chemical: nicotine; Chemical: methamphetamine
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: nicotine; Chemical: methamphetamine