910
Pretreatment of mice with alpha - methyltyrosine ( 20 mg / kg i . p . , one hour ) , an inhibitor of tyrosine hydroxylase , significantly decreased the activity - increasing effects of morphine .
 Chemical: alpha - methyltyrosine; Chemical: tyrosine; 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: alpha - methyltyrosine, tyrosine, morphine 
Answer:
 Chemical: alpha - methyltyrosine; Chemical: tyrosine; Chemical: morphine