This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Which of the flowing drug can induce panic disorder? 
Select and explain. 
A. Yohimbine, B. Sildenafil, C. PGE1, D. All of the above
B: Sildenafil
Answer: B: Sildenafil 
Explanation: Neurobiological mechanisms ofpanic anxiety: biochemical and behavioral correlates of yohimbine-induced panic attacks. ... The patients repoing yohimbine-induced panic attacks had significantly larger increases in plasma MHPG, coisol, systolic blood pressure, and hea rate than the healthy subjects Ref ganong's review of medical physiology 25e 787