A 50 year old guy presented with 25 years of married life, having 5 years of established doubt on his wife’s fidelity, despite proof to the contrary, and his other aspects of life are normal. The probable diagnosis is
**Core Concept**
The underlying principle being tested is the diagnosis of a psychiatric condition characterized by delusions of infidelity. This condition is known as **Othello syndrome**, a type of **delusional disorder**. The key feature is a persistent, unfounded belief that one's spouse is being unfaithful.
**Why the Correct Answer is Right**
The correct answer is related to Othello syndrome, which is a psychiatric condition where an individual has a delusional belief that their spouse or sexual partner is unfaithful without having any real proof. This condition is often associated with **jealousy** and can lead to significant distress and impairment in relationships. The diagnosis is based on the presence of a persistent delusion of infidelity, which is not better explained by another psychiatric condition.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it does not specifically relate to delusions of infidelity.
**Option B:** This option is also incorrect as it does not match the description of Othello syndrome.
**Option C:** This choice is incorrect because it is unrelated to the symptoms described.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that Othello syndrome is a type of **delusional disorder**, which can be challenging to treat due to the patient's fixed belief. Recognizing the condition early is crucial for effective management and preventing harm to relationships.
**Correct Answer:** D. Othello syndrome.