5716
In the 21 d exposure , B - and T - lymphocytes in blood showed a significant Dose x A . s . interaction , indicating stimulated blood cell proliferation due to naphthenic acids alone as well as due to A . s .
 naphthenic acids
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 naphthenic acids