2998
Healthy participants were randomised to receive oral CBD 600 mg ( n = 22 ) or placebo ( n = 26 ) , 210 min ahead of intravenous ( IV ) THC ( 1 . 5 mg ) .
 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