4580
The increased odds ratio associated with products containing 20 micrograms ethinyloestradiol and desogestrel compared with the 30 micrograms product is biologically implausible , and is likely to be the result of preferential prescribing and , thus , confounding .
 Chemical: ethinyloestradiol; Chemical: desogestrel
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: ethinyloestradiol; Chemical: desogestrel