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In a between - subjects design , we tested the hypothesis that pre - treatment with CBD inhibited THC - elicited psychosis and cognitive impairment .
 Chemical: CBD; Chemical: THC
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: CBD, THC 
Answer:
 Chemical: CBD; Chemical: THC