3004
Rats were pretreated with saline or nicotine ( 1 . 5 mg / kg per day ) by subcutaneously implanting each animal with an Alzet osmotic mini - pump which continuously released saline or nicotine for 1 , 5 and 14 days .
 Chemical: nicotine; Chemical: nicotine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: nicotine; Chemical: nicotine