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Male Sprague Dawley rats were treated with betaine ( 100 , 200 , and 400 mg / kg ) orally for 40 days .
 Chemical: betaine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: betaine