This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Which of the following drugs is preferred for long term treatment of severe anxiety disorder with intermittent panic attacks ? \nSelect and explain. \nA. Phenothiazine, B. Azapirone, C. β blocker, D. Selective serotonin reuptake inhibitor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]