The correct answer is D. Elderly patients with a fragile mental or medical status.
Step-by-step explanation
Delirium is a term to refer to an alteration of the mind that produces hallucinations and incoherent thoughts in a person. Also, it is usually associated with actions, phrases or other manifestations that express that type of thinking. In psychology, delirium is considered a symptom of psychotic disorder, which causes the individual to believe things that are not part of reality. It is not a misunderstanding, handling false information or a passing mistake; delirium is pathological and has its cause in a disease. In general, this disease manifests itself in advanced ages, due to the deterioration that the brain may have had throughout life, this disease presents if the individual has consumed drugs in excess, has suffered urinary infections, pneumonia or severe flu, dehydration, sleep deprivation, among others. So, the correct answer is D. Elderly patients with a fragile mental or medical status.