After a Very Discordant Divorce, Mr

After a very discordant divorce, Mr. A develops intense paranoia, begins to hear the voice of his estranged ex-wife, and feels that people are trying to hurt him. He is admitted to an acute care psychiatric hospital. Within 12 hours of the development of these symptoms, he shows complete resolution of all his symptoms. What is his diagnosis?

A) Delusional disorder
B) Shared psychotic disorder (folie à deux)
C) Brief psychotic disorder
D) Substance-induced psychotic disorder