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
Global cerebral dysfunction characterized by alteration in cognitive function and consciousness is known as - 
Select and explain. 
A. Acute anxiety, B. Depression, C. Delirium, D. Dementia
C: Delirium
Answer: C: Delirium 
Explanation: Infection (like pneumonia) is one of the cause of delirium.
Altered sensorium, disorientation to place (Patient thinks he is in jail) and person (not recognizing the doctor and staff), and hallucinations (scorpions attacking him) suggest the diagnosis of delirium.