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
Dementia is/are pesent in all except: 
Select and explain. 
A. Alzeimer's disease, B. Pick's disease, C. Lewy body, D. Ganser syndrome
D: Ganser syndrome
Answer: D: Ganser syndrome 
Explanation: D i.e. Ganser syndrome