912
The study suggests that the activity - increasing effects of morphine are mediated by the release of catecholamines from adrenergic neurons in the brain .
 Chemical: morphine; Chemical: catecholamines
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: morphine, catecholamines 
Answer:
 Chemical: morphine; Chemical: catecholamines