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Tetrahydrocannabinol ( THC ) , the major psychoactive component of marijuana , is a cannabinoid agonist that exerts its effects by activating at least two specific receptors ( CB1 and CB2 ) that belong to the seven transmembrane G - protein coupled receptor ( GPCR ) family .
 Chemical: Tetrahydrocannabinol; Chemical: THC
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: Tetrahydrocannabinol; Chemical: THC