参考答案：D

解析：A person can convert unbearable feelings into a physical symptom with no organic cause. This defense mechanism usually manifests itself near the time of a traumatic or conflict-producing event. The symptom commonly provides attention or a means of escaping the conflict. Repression is a defense mechanism in which a person unconsciously keeps unwanted feelings from entering awareness. Transference involves the projection of feelings, thoughts, and wishes (positive or negative) onto someone, usually a therapist, who represents a figure from the person’s past. Reaction formation is a means of alleviating unresolved conflicts between feelings or impulses by reinforcing one feeling and repressing another, thereby disguising the true feelings from the self.