## **Core Concept**
Ekbom syndrome, also known as delusional parasitosis, is a psychiatric disorder where a person has a fixed delusional belief that they are infested with living organisms, such as parasites, insects, or worms, that are not present on their skin. This condition falls under the category of delusional disorders. The delusion leads to significant distress and can result in excessive scratching, skin damage, and other behavioral changes.

## **Why the Correct Answer is Right**
The correct answer, **D. Delusional parasitosis**, is right because Ekbom syndrome is characterized by a persistent delusional belief of being infested by parasites or insects. This condition is a type of monosymptomatic hypochondriacal psychosis. The delusional belief is not based on reality and does not change even when presented with evidence to the contrary. The term "delusional parasitosis" accurately describes the nature of the delusion.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately describe Ekbom syndrome. Without the specific text provided, it's not possible to detail why, but it can be inferred that it does not relate to delusional parasitosis.
- **Option B:** Similarly, this option is incorrect as it does not correspond with the definition or characteristics of Ekbom syndrome or delusional parasitosis.
- **Option C:** This option is also incorrect for the same reason; it does not align with the known definition of Ekbom syndrome.

## **Clinical Pearl / High-Yield Fact**
A memorable point for students to remember is that Ekbom syndrome often presents with a complaint of skin infestation, and patients may bring in specimens (often lint, skin flakes, or other debris) as "evidence" of the parasites. A key clinical approach is to address the psychological aspect of the condition, often involving psychiatric referral.

## **Correct Answer: D. Delusional parasitosis**