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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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In psychoanalytic terms, obsessive-compulsive disorder is fixed at -
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The correct answer is  OCD results from a regression from the oedipal phase to anal phase of psychosexual development, i.e. In OCD fixation occurs in anal stage (Note - Regression is reversion from higher level of development to lower level of development).