**Core Concept**
Psychoanalysis is a clinical method for treating mental health disorders, focusing on the unconscious mind and childhood experiences. It emphasizes the role of repressed thoughts, feelings, and memories in shaping behavior and emotions. Developed by Sigmund Freud, psychoanalysis is a foundational theory in psychiatry.

**Why the Correct Answer is Right**
Sigmund Freud, an Austrian neurologist, is the founder of psychoanalysis. He introduced concepts like the unconscious mind, defense mechanisms, and the structure of personality (id, ego, and superego). Freud's work, particularly his book "The Interpretation of Dreams," laid the groundwork for psychoanalytic theory and practice. His techniques, such as free association and dream analysis, are still used in various forms today.

**Why Each Wrong Option is Incorrect**
**Option A:** John Broadus Watson is associated with behaviorism, a different psychological theory that focuses on observable behavior and environmental factors. Watson's work, particularly his book "Behaviorism," contrasts with Freud's psychoanalytic approach.
**Option B:** Carl Gustav Jung was a Swiss psychiatrist who developed analytical psychology, a school of thought that diverged from Freud's psychoanalysis. Jung's theories, such as the concept of the collective unconscious, are distinct from Freud's ideas.
**Option D:** Wilhelm Reich was an Austrian psychoanalyst who later developed his own theories, including the concept of orgone energy. While Reich was influenced by Freud, his work is not representative of the core principles of psychoanalysis.

**Clinical Pearl / High-Yield Fact**
To remember the key figures in psychoanalysis, use the acronym "FREUD": Focuses on the unconscious, Reveals repressed thoughts, Explains behavior, Understands the past, and Develops therapeutic techniques. This mnemonic can help you associate Freud's work with the core concepts of psychoanalysis.

**✓ Correct Answer: C. Sigmond Freud**