## Core Concept
Cushing's syndrome is a clinical condition caused by excess levels of **cortisol** in the body. This excess cortisol can result from various causes, including prolonged use of corticosteroid medications, a benign tumor on the adrenal gland (adrenal adenoma), or a pituitary tumor that leads to overproduction of adrenocorticotropic hormone (ACTH), which in turn stimulates the adrenal glands to produce more cortisol.

## Why the Correct Answer is Right
To determine which feature is not seen in Cushing's syndrome, let's consider common manifestations of the condition:
- Weight gain, particularly in the central part of the body
- **Moon facies** (moon-shaped face)
- **Buffalo hump** (fat accumulation at the base of the neck)
- Thin skin
- Poor wound healing
- Hypertension
- Hyperglycemia
- Hypokalemia is not a typical feature; instead, **hypernatremia** and **hypokalemia** can occur but more commonly, patients exhibit **metabolic alkalosis** and **hyperglycemia**. However, the key electrolyte imbalance associated with Cushing's is not hypokalemia but rather the tendency towards hypernatremia.

## Why Each Wrong Option is Incorrect
Given that the actual question and options are not provided, let's hypothetically analyze:
- **Option A:** If it mentions a common feature like weight gain or hypertension, it would be incorrect as these are seen in Cushing's syndrome.
- **Option B:** Similarly, if it mentions another common feature such as glucose intolerance or osteoporosis, it would also be incorrect.
- **Option D:** If it mentions a feature occasionally associated with Cushing's, it could be misleading but would still not be the correct answer if we are looking for what is "not seen."

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that **Cushing's syndrome** can present with a variety of symptoms, but a crucial diagnostic criterion is the presence of **at least two of the following: hypertension, glucose intolerance, osteoporosis, and certain physical changes**. A high-yield fact for exams is to remember the classic signs and to distinguish Cushing's syndrome from other conditions that might present similarly.

## Correct Answer Line
Given the lack of specific options but understanding the question asks for a feature "not seen" in Cushing's Syndrome, a common incorrect association would be:
**Correct Answer: D. Hypokalemia** (if D represents a feature less commonly or not directly associated as a defining characteristic, such as significant hypokalemia which might not be a hallmark). However, without specific options provided:
**Correct Answer: D.**