A nurse practitioner is evaluating a client who has been increasingly forgetful and agitated and has been indiscriminately spending money over the past 6 months; the client is concerned that reason may be Alzheimer disease. The nurse explains that it may not be Alzheimer disease, that there are many potentially reversible causes of dementia such as which of the following? Select all that apply. Huntington disease Frontotemporal dementia Anticholinergic drugs Hypothyroidism Vitamin B12 deficiency