An older adult is referred to a geriatric nurse practitioner because of changes in memory and reports by family members that "there is something different about her." The nurse practitioner evaluates the older adult for which potentially reversible causes for the changes? (Select all that apply.)

A. Delirium is a potentially reversible cause of cognitive changes, often triggered by acute illness, infection, or medication. B. Depression in older adults can mimic dementia and cause memory or concentration issues, and it is reversible with treatment. C. Osteoporosis affects bones, not cognition, and is not related to changes in memory or behavior. D. Medication side effects (e.g., anticholinergics, sedatives) are a common and reversible cause of cognitive impairment in older adults. E. Rheumatoid arthritis is a chronic autoimmune joint disease and does not directly cause cognitive changes.