This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Organic Mental Disorders, Subject name: Psychiatry
Delirium and schizophrenia differ from each other by: 
Select and explain. 
A. Change in mood, B. Clouding of consciousness, C. Tangential thinking, D. All of the above
B: Clouding of consciousness
Answer: B: Clouding of consciousness 
Explanation: Delirium presents with clouding of consciousness whereas in schizophrenia consciousness is intact. The mood changes and tangential thinking cannot be used for differentiation.