20995
Nicotine pre - exposure resulted in an increased brain arsenic accumulation and a decreased liver arsenic concentration .
 Chemical: Nicotine; Chemical: arsenic; Chemical: arsenic
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: arsenic; Chemical: arsenic