Step 1: Understanding the Concept:
The question asks for the classification of Body Dysmorphic Disorder (BDD) in the DSM-5. BDD is a disorder characterized by a preoccupation with a perceived flaw in one's appearance that is not observable or appears slight to others.
Step 2: Detailed Explanation:
In the previous DSM-IV, Body Dysmorphic Disorder was classified under "Somatoform Disorders" because it involved a preoccupation with the body. However, research increasingly highlighted the strong obsessive-compulsive features of BDD, such as the obsessive thoughts about the perceived defect and compulsive behaviors like mirror checking, skin picking, or excessive grooming. Recognizing this strong overlap, the creators of the DSM-5 moved BDD into the new chapter titled "OCD and related disorders," alongside Obsessive-Compulsive Disorder, Hoarding Disorder, etc.
Step 3: Final Answer:
In DSM-5, Body Dysmorphic Disorder is placed in the chapter for OCD and related disorders.