17963
The catechol - O - methyltransferase ( COMT ) Val158Met polymorphism may be a risk factor for nicotine addiction .
 Chemical: catechol; Chemical: O; Chemical: nicotine
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: catechol; Chemical: O; Chemical: nicotine