7038
For acute toxicity study , a single dose of 2000 and 5000 mg / kg of the B . ferruginea root bark extract was given orally to healthy male Wistar rats and Balb / c mice .
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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:
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