This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anxiety & Stress, Subject name: Psychiatry
[{'content': 'Substance responsible for erection of penis - \nSelect and explain. \nA. Clomipramine, B. Papaverine, C. Buspirone, D. Amitriptyline', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Papaverine Papaverineo It is a nonspecific phosphodiesterase inhibitor.o Injection of papaverine with or without phentolamine into corpus cavemosum produces penile tumiscence to permit intercourse.o Repeated injection can cause penile fibrosis.", 'role': 'assistant'}]