Folie a deux is seen in
**Folie à Deux**
**Core Concept**
Folie à deux, also known as shared psychosis, is a rare psychiatric syndrome in which symptoms of a delusional belief are transmitted from one individual to another. This phenomenon is characterized by the spread of a delusional belief from a dominant individual to a more susceptible person, often a family member or close associate.
**Why the Correct Answer is Right**
In folie à deux, the dominant individual, often referred to as the "primary case," has a pre-existing delusional disorder. This individual influences the secondary case, who may be a family member or close associate, by providing false information, emotional support, or even inducing the delusional belief through suggestion. The secondary case may adopt the delusional belief as their own, and in some cases, the delusional disorder can be more severe in the secondary case.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the definition of folie à deux.
* **Option B:** While this option may seem plausible, it is not a characteristic of folie à deux, which is specifically defined by the transmission of delusional beliefs between individuals.
* **Option C:** This option is unrelated to the concept of folie à deux.
**Clinical Pearl / High-Yield Fact**
Folie à deux is often seen in close relationships, such as between family members or spouses, and can be a challenge to diagnose due to the complex interplay of factors involved.
**Correct Answer:** D.