4571
We used a multiple logistic regression model that included body - mass index , number of cycles , change in type of OC prescribed within 3 months of the event , previous pregnancy , and concurrent disease .
 Chemical: OC
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: OC