This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Schizophrenia Spectrum and Other Psychotic Disorders, Subject name: Psychiatry
[{'content': "Blood sample of a 45 year old male shown increased levels of homovanillic acid. This patient is most likely suffering from:- \nSelect and explain. \nA. Dementia, B. Schizophrenia, C. Depression, D. Parkinson's disease", 'role': 'user'}, {'content': "Answer: B \nExplanation: The HVA is a metabolite of dopamine. Dopamine is usually increased in schizophrenia. Psychopathology Increased (|) or Decreased (|) Concentration of Metabolite in Blood Plasma, Cerebrospinal Neurotransmitter Fluid, or Urine Schizophrenia Conditions involving psychosis (|) HVA (homovanillic acid) Dopamine Parkinson's disease Treatment with anti-psychotic agents Depression (|) HVA Dopamine", 'role': 'assistant'}]