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
Which of the following feature differentiates between delirium from dementia? 
Select and explain. 
A. Confusion, B. Difficulty in communication, C. Hallucination, D. Memory loss
A: Confusion
Answer: A: Confusion 
Explanation: Altered sensorium and confusional state is seen only in delirium which is absent in dementia.