1195
RESULTS : Among 167 methadone maintenance patients , the prevalence of QTc prolongation to 0 . 50 second ( ( 1 / 2 ) ) or longer was 16 . 2 % compared with 0 % in 80 control subjects .
 Chemical: methadone
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: methadone