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': 'Which of the following statement regarding dual sex therapy is true? \nSelect and explain. \nA. Patient alone is not treated, B. Uses sildenafil, C. It treats sexual perversions, D. It is used for people with dual gender identities', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The theoretical basis of dual-sex therapy is the concept of the marital unit or dyad as the object of therapy. In dual-sex therapy, treatment is based on a concept that the couple must be treated when a dysfunctional person is in a relationship. Because both are involved in a sexually distressing situation, both must paicipate in the therapy program. Dual sex therapy aka "Master and Johnson therapy".', 'role': 'assistant'}]