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CONCLUSIONS : Our results suggest that the carbonic anhydrase enzyme may constitute part of a common VTA GABA neuron - based biological pathway responsible for controlling the mechanisms underlying opiate motivation , supporting the hypothesis that VTA GABA ( A ) receptor hyperpolarization or depolarization is responsible for selecting TPP - or dopamine - dependent motivational outputs , respectively .
 Chemical: GABA; Chemical: GABA; Chemical: dopamine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: GABA; Chemical: GABA; Chemical: dopamine