Answer: Persecutory delusion
Explanation: By definition of Schizophrenia, It is a disorder that affects a person's ability to think, feel or behave correctly. A correct example of schizophrenic symptom that suit the questions asked is the persecutory delusion.
Persecutory delusion is what schizophrenic patients may experience especially the elderly. It is a psychological issue where the patient thinks that someone is out to harm or harm is occurring to him, someone wants to poison him or her. Though there are medications that can be use to manage it such as antipsychotic drugs such as Chlorpromazine and Haloperidol.