1988
Moderate or severe adverse events were more common in subjects on clonidine ( 79 . 4 % versus 49 . 2 % ; p = . 0006 ) but not associated with higher rates of early study withdrawal .
 Chemical: clonidine
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: clonidine 
Answer:
 Chemical: clonidine