<prompt> A 30 year old man since 2 months suspects that his wife is having an affair with his boss. He thinks his friend is also involved from abroad and is providing technical support. He thinks people talk ill about him. His friends tried to convince him but he is not convinced at all. Otherwise, he is normal, he doesnt have any thought disorder or any other inappropriate behavior. The most likely diagnosis is -Paranoid personality disorderPersistent delusion disorderSchizophreniaAcute and transient psychosis  <response>: Persistent delusional disorder is characterized by non bizarre delusions i.e. involving situations that occur in real life e.g. deceived by spouse of at least 1 month duration DSM IV but with absence of :Prominent hallucinations flattening of affectThought disorder, mood disorder, inappropriate behaviorCognition, memory consciousness impairment 