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Previous investigations have determined that , in response to clonidine , ultrasound production increases through the 2nd - week postpartum and decreases thereafter .
 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