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: Surgery
The commonest symptom post operatively seen is ? 
Select and explain. 
A. Depression, B. Psychosis, C. Euphoria, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: Ans. is 'd' i.e., None of the above Delirium is the commonest psychiatric problem postoperatively (1) Delirium - 20 % (2) Depression- 9% (3) Dementia- 3% (4) Functional Psychosis- 2%