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
[{'content': 'Ego\'s defence mechanism "Undoing" is typically seen in: \nSelect and explain. \nA. Depression, B. Schizophrenia, C. Obsessive compulsive neurosis, D. Hysteria', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C .e. Obsession', 'role': 'assistant'}]