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
Mood congruent delusion seen in Depression 
Select and explain. 
A. Delusion of grandeur, B. Delusion of nihilisim, C. Delusional parasitosis, D. Delusion of reference
B: Delusion of nihilisim
Answer: B: Delusion of nihilisim 
Explanation: Nihilistic delusion is seen severe depression where patient denies the existence of himself & world. Also called as "Cotard syndrome".