7043
In sub - chronic toxicity study , administration of the B . ferruginea root bark extract at 250 , 500 , and 1000 mg / kg for 28 consecutive days to Wistar rats did not produce mortality .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None