1971
AIM : To determine the hemodynamic responses , efficacy and adverse events associated with the use of high dose dexmedetomidine as the sole sedative for magnetic resonance imaging ( MRI ) studies .
 Chemical: dexmedetomidine
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: dexmedetomidine 
Answer:
 Chemical: dexmedetomidine