8251
Sixty - four arsenic ( As ) resistant bacteria isolated from an arsenic rich groundwater sample of West Bengal were characterized to investigate their potential role in subsurface arsenic mobilization .
 Chemical: arsenic; Chemical: As; Chemical: arsenic; 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; Chemical: As; Chemical: arsenic; Chemical: arsenic