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
Ego's defence mechanism "Undoing" is typically seen in: 
Select and explain. 
A. Depression, B. Schizophrenia, C. Obsessive compulsive neurosis, D. Hysteria
C: Obsessive compulsive neurosis
Answer: C: Obsessive compulsive neurosis 
Explanation: C .e. Obsession