4483
Arsenic speciation indicated arsenobetaine as the major arseno - compound accounting for 43 . 2 - 76 . 3 % of total content of As .
 Chemical: Arsenic; Chemical: arsenobetaine; Chemical: arseno; Chemical: As
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: arseno; Chemical: As