This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': 'All the following drugs act on cannabinoid receptors except \nSelect and explain. \nA. Nabilone, B. Rimonabant, C. Mescaline, D. Dronabinol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mescaline does not act on cannabinoid receptors. Dronabinol and nabilone increase appetite and act as antiemetics. Rimonabant is banned now(D/T increased suicides) Mescaline is a naturally occuring hallucinogenic drug. Ref: KD Tripathi, 8th ed', 'role': 'assistant'}]