This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Delirium is differentiated from dementia by: 
Select and explain. 
A. Ataxia, B. Apraxia, C. Alexia, D. Altered sensorium
D: Altered sensorium
Answer: D: Altered sensorium 
Explanation: Altered sensorium