8252
Among the isolated strains predominance of genera Agrobacterium / Rhizobium , Ochrobactrum and Achromobacter which could grow chemolitrophically and utilize arsenic as electron donor were detected .
 Chemical: arsenic
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: arsenic