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Arsenic speciation analysis showed that the less - toxic arsenobetaine ( AsB ) constituted 80 . 6 - 98 . 8 % of all As compounds , and dimethylarsinic acid ( DMA ) constituted 0 . 47 - 3 . 44 % .
 Chemical: Arsenic; Chemical: arsenobetaine; Chemical: AsB; Chemical: dimethylarsinic acid; Chemical: DMA
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: arsenobetaine; Chemical: AsB; Chemical: dimethylarsinic acid; Chemical: DMA