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Male Wistar rats were implanted bilaterally with cannulae into the accumbens shell or core , and then were locally injected with GR 55562 ( an antagonist of 5 - HT1B receptors ) or CP 93129 ( an agonist of 5 - HT1B receptors ) .
 Chemical: GR 55562; Chemical: CP 93129
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: GR 55562, CP 93129 
Answer:
 Chemical: GR 55562; Chemical: CP 93129