Which of the following is not used in delirium -: (A) Haloperidol, (B) Lithium, (C) Diazepam, (D) Olanzapine
Answer is B. Drugs used for delirium 
1) Typical antipsychotics : - Haloperidol (DOC), Thioridazine, Chlorpromazine.
2)Atypical antipsyclzotics : - Risperidone, quetiapine, olanzapine.
3) Benzodiazepines (for delirium tremens) : - Chlordiazepoxide, Diazepam, Lorazepam, Clonazepam.