11001
The dietary concentration predicted to result in 20 % kit mortality ( LC20 ) at six weeks of age was 0 . 34 micro g sum PCBs / g feed ( 2 . 6 pg TEQWHO 2005 / g feed ) .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None