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Significant increases in drowsiness were reported in patients treated with ketamine in both groups and were more marked with ketamine 0 . 50 mg / kg .
 Chemical: ketamine; Chemical: ketamine
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: ketamine, ketamine 
Answer:
 Chemical: ketamine; Chemical: ketamine