## Core Concept
Masked depression, also known as depressive equivalents or hidden depression, refers to a condition where the primary symptoms of depression are not directly apparent, and instead, patients present with somatic or physical complaints. This condition is often seen in patients who deny or minimize experiencing depressive symptoms.

## Why the Correct Answer is Right
The correct answer, ., is a feature that does not typically align with masked depression. Masked depression usually presents with physical symptoms such as chronic pain, headaches, or gastrointestinal issues without the patient acknowledging depressive feelings. The presence of clear-cut depressive symptoms like persistent sadness or loss of interest would not characterize masked depression.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option might represent a common physical complaint seen in masked depression, making it an incorrect choice as an exception.
* **Option B:** - Similarly, this could be another manifestation of masked depression, thus not being the correct answer to the exception question.
* **Option C:** - This might also represent a feature compatible with masked depression, hence not the correct exception.

## Clinical Pearl / High-Yield Fact
A key point to remember is that masked depression is more commonly observed in certain cultural contexts where there might be stigma associated with mental illness, leading patients to express their depression through physical symptoms. Being aware of this can help in early diagnosis and appropriate management.

## Correct Answer: D.