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
Delusion of Nihilism and Early morning insomnia are characteristic features of 
Select and explain. 
A. Mania, B. Major depression, C. Personality disorder, D. Personality disorder
B: Major depression
Answer: B: Major depression 
Explanation: B i.e. Major depression