This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Basics of Psychiatry, Subject name: Psychiatry
Delusion of infidelity is seen in: 
Select and explain. 
A. Othello syndrome, B. Dechlerambault syndrome, C. Magnan syndrome, D. Cotard syndrome
A: Othello syndrome
Answer: A: Othello syndrome 
Explanation: Othello syndrome is also called delusional jealousy or morbid jealousy. This is a state of false fixed belief that the spouse is unfaithful. It is more common in men and alcoholics. It can also associated with schizophrenia and cocaine use. It can lead the individual to act on the delusion and thereby become violent or stalk.