This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Psychoanalysis, Subject name: Psychiatry
Defense mechanism in depression 
Select and explain. 
A. Altruism, B. Projection, C. Undoing, D. Introjection
D: Introjection
Answer: D: Introjection 
Explanation: Defence mechanism in disease Disease Defence mechanism Psychosis Projection Neurosis Repression Phobia Displacement Inhibition Depression Introjection OCD Undoing Reaction formation