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
Which of the following drugs is preferred for long term treatment of severe anxiety disorder with intermittent panic attacks ? 
Select and explain. 
A. Phenothiazine, B. Azapirone, C. β blocker, D. Selective serotonin reuptake inhibitor
D: Selective serotonin reuptake inhibitor
Answer: D: Selective serotonin reuptake inhibitor 
Explanation: None