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A slow bolus of subhypnotic doses of ketamine ( 0 . 25 mg / kg or 0 . 50 mg / kg ) was given to 10 cancer patients whose pain was unrelieved by morphine in a randomized , double - blind , crossover , double - dose study .
 Chemical: ketamine; Disease: cancer; Disease: pain; Chemical: morphine
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, cancer, pain, morphine 
Answer:
 Chemical: ketamine; Disease: cancer; Disease: pain; Chemical: morphine