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: Psychiatry
[{'content': 'Test to differentiate between psychological and organic erectile dysfunction: NEET 13 \nSelect and explain. \nA. Pharmacologically induced penile erection therapy, B. Nocturnal penile tumescence, C. Sildenafil induced erection, D. Squeeze technique', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Nocturnal penile tumescence', 'role': 'assistant'}]