7544
Strong negative correlations ( r = - 0 . 95 to - 0 . 98 ) between the PHA response and dioxins and PCBs in gull livers was strong evidence suggesting that these chemicals contribute significantly to immunosuppression in New York Harbor waterbirds .
 Chemical: dioxins; Chemical: PCBs
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: dioxins; Chemical: PCBs