3975
After 2 weeks , the rats were subjected to ganglionic blockade and 2 days later , an infusion of clonidine .
 Chemical: clonidine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: clonidine