This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
A 28 year old female presents with complains of reduced sleep with disorganized behaviour for 9 months. She feels there is a camera fixed behind her head which always follows her. Which of the following is likely diagnosis - 
Select and explain. 
A. Psychotic depression, B. Paranoid schizophrenia, C. Delusional disorder, D. Insomnia
B: Paranoid schizophrenia
Answer: B: Paranoid schizophrenia 
Explanation: The patient in question has : -


Symptoms for 9 months
Disorganized behaviour
Delusions (Camera is fixed behind her head)


So, the patient fits into the diagnostic criteria of schizophrenia, i.e. two or more following symptoms (i) Delusions; (ii) Hallucinations; (iii) Disorganized speech; (iv) disorganized or catatonic behavior; (v) Negative symptoms.