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 ) .
 CBD, THC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 CBD, THC