1588
A case control study of 70 patients of AD and 75 controls was done to examine the association between organochlorine pesticides ( OCPs ) and risk of AD .
 Chemical: organochlorine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: organochlorine