This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Psychiatry
True statement regarding delirium includes 
Select and explain. 
A. Insidious onset, B. Clear consciousness, C. Irreversible, D. Decreased attention
D: Decreased attention
Answer: D: Decreased attention 
Explanation: (D) Decreased attention # DELIRIUM:> Delirium is defined as a transient, usually reversible, cause of cerebral dysfunction and manifests clinically with a wide range of neuropsychiatric abnormalities.> Clinical hallmarks are decreased attention span and a waxing and waning type of confusion.> Delirium or acute confusional state is a transient global disorder of cognition.