A 24 year old female working in a office thinks his boss is secretly in love with her. Even though he denies the facts, she feels he is hiding it from her. This disorder is suggestive of: (A) Declerembault syndrome, (B) Cotard syndrome, (C) Othello syndrome, (D) Capgrass syndrome
Answer is A. Declerembault syndrome also called as Erotomania is where a female usually of lower socioeconomic status believes that  a high profile male is secretly in love with her.

Cotard syndrome : Delusion of Nihilism.
Othello syndrome : Delusion of Infidelity.
Capgrass syndrome : Delusion of Doubles.