This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neurotic, Stress Related and Somatoform Disorders, Subject name: Psychiatry
[{'content': 'Which of the following is considered as an anxiolytic substance? \nSelect and explain. \nA. Caffeine, B. Cholecystokinin, C. Neuropeptide Y, D. Carbondioxide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Anxiolytic substances Anxiogenic substances Benzodiazepines Selective Serotonin Reuptake Inhibitors Beta-blockers Neuropeptide Y Buspirone Carbon dioxide Cholecystokinin Flumazenil Caffeine', 'role': 'assistant'}]