A 55-year-old man come to see the doctor with a chief complaint of insomnia two days, he has drunk alcoholic beverage about 30 years. He has tried to quit drinking several times, but he has been un-able to stop.Twodays ago,he tried to stop drinking once again.He states that he goes to sleep difficulty, feels nausea and anxiety.For this patient,which of the following treatment is best

• A、antipsychotic
• B、antidepressant drug
• C、benzodiazepine
• D、anticholinergic agents
• E、clinical observation