4300
This may indicate that an activation of the peripheral adrenergic mechanism plays an important role in the induction of the excitatory effect of ketamine injected in the SA node artery .
 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 
Answer:
 Chemical: ketamine