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Arsenic trioxide ( ATO ) is widely used in tumor treatment , but excessive arsenic exposure can have adverse effects .
 Chemical: Arsenic trioxide; Chemical: ATO; 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 trioxide; Chemical: ATO; Chemical: arsenic