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Treatment groups including group A : chickens fed basal diet , group B : chickens fed 3 ppm productive aflatoxin in basal diet , group C : chickens fed basal diet plus 2500 ppm Nanocid , and group D : chickens fed 3 ppm productive aflatoxin and 2500 ppm Nanocid , in basal diet .
 aflatoxin, aflatoxin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 aflatoxin, aflatoxin