509
The adjusted odds ratio was 2 . 5 ( 95 percent confidence interval , 1 . 5 to 4 . 1 ) among women who used second - generation oral contraceptives and 1 . 3 ( 95 percent confidence interval , 0 . 7 to 2 . 5 ) among those who used third - generation oral contraceptives .
 Chemical: oral contraceptives; Chemical: oral contraceptives
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: oral contraceptives, oral contraceptives 
Answer:
 Chemical: oral contraceptives; Chemical: oral contraceptives