2260
Single nucleotide polymorphisms ( SNPs ) in the catechol - O - methyltransferase ( COMT ) gene have been related to cognitive function .
 Chemical: catechol; Chemical: O
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: catechol, O 
Answer:
 Chemical: catechol; Chemical: O