**Core Concept**
Body dysmorphic disorder (BDD) is a mental health condition characterized by a persistent preoccupation with a perceived flaw in one's appearance, which is not shared by others, leading to significant distress and impairment in daily functioning.

**Why the Correct Answer is Right**
Basanti's preoccupation with her nose being ugly, despite others not sharing her concern, is a classic symptom of BDD. Her avoidance of social situations due to hiding her face is also indicative of the disorder. The next step would be to refer her to a psychiatrist or a mental health professional for a comprehensive evaluation and treatment, rather than a surgeon for plastic surgery. This is because BDD often requires a multidisciplinary treatment approach, including psychotherapy and pharmacotherapy, to address the underlying psychological issues.

**Why Each Wrong Option is Incorrect**
* **Option A:** Referring Basanti to a surgeon for plastic surgery would be inappropriate, as it would focus solely on the physical aspect of her concern, rather than addressing the underlying psychological issues driving her behavior.
* **Option B:** Prescribing Basanti medication for anxiety or depression without a proper diagnosis and treatment plan would be premature and potentially ineffective.
* **Option D:** Sending Basanti for a second opinion with another surgeon would not address the underlying psychological issues and may perpetuate the focus on physical appearance.

**Clinical Pearl / High-Yield Fact**
Body dysmorphic disorder often co-occurs with other mental health conditions, such as depression, anxiety, and obsessive-compulsive disorder. A comprehensive evaluation by a mental health professional is essential to develop an effective treatment plan.

**Correct Answer:** C.