<prompt> Blood sample of a 45 year old male shown increased levels of homovanillic acid. This patient is most likely suffering from:-DementiaSchizophreniaDepressionParkinsons disease  <response>: 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 Parkinsons disease Treatment with anti-psychotic agents Depression HVA Dopamine 