1562
Male SD rats ( n = 30 ) were treated with Ato ( 50 mg / kg per day in drinking water ) or tap water for 15 days .
 Chemical: Ato
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: Ato 
Answer:
 Chemical: Ato