Seemingly normal patient presents to your office with the chief complaint of "I think my ex boyfriend is stalking me". She said she's been thinking this for the last 2 months after he liked one of her most recent Facebook photos. A substance being the source of her thoughts has been ruled out. What's your DDx?
a) Schizophreniform
b) Schizoaffective
c) Delusional disorder
d) Brief psychotic disorder
Answer: C
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