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
Nihilistic ideas are seen in -a) Simple schizophreniab) Paranoid schizophreniac) Cotard's syndromed) Depressione) Body dysmorphic disorder 
Select and explain. 
A. cd, B. bc, C. bd, D. ac
A: cd
Answer: A: cd 
Explanation: Nihilistic delusion is false belief that oneself, other or the world is non-existent or about to end. It is seen in severe depression.
If nihilistic delusions are accompanied by ideas concerning bodily function failure, the syndrome is called Cotard's syndrome.