单选题 Sedative-hypnotic drugs are used to treat which of the following problems?
A. Hallucinations and delusions.
B. Anxiety and insomnia.
C. Obsessive-compulsive disorder (OCD).
D. Attention deficit hyperactivity disorder (ADHD).

【正确答案】 B

【答案解析】Sedative-hypnotic drugs aren't linked to the treatment of a specific disorder. They're used to treat anxiety and insomnia, which can occur in a range of psychiatric disorders. Antidepressants are used to treat OCD. Psychostimulants are used to treat ADHD. Hallucinations and delusions are treated with antipsychotics.