This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Which one of the following can be seen in Othello syndrome? 
Select and explain. 
A. Delusion of persecution, B. Delusion of Grandeur, C. Delusion of Infidelity, D. Delusion of Doubles
C: Delusion of Infidelity
Answer: C: Delusion of Infidelity 
Explanation: Othello Syndrome or Delusional jealousy is a psychiatric disorder in which a person holds a strong delusional belief that their spouse or sexual paner is being unfaithful without having any, very little, or insignificant proof to back up their claim. People who suffer from this disorder have a strong association with stalking, cyberstalking, sabotage, or even violence. It can be found in the context of schizophrenia and delusional disorder, such as bipolar disorder, but is also associated with alcoholism and sexual dysfunction and after neurological illness.