Nicole, a 23-year old graduate student, is convinced that she contracted mad cow disease whilestudying in Great Britain. She has seen many doctors, including neurologists, who all confirm that she is healthy. Despite their reassurances, Nicole continues to believe that she is ill and plans to continue her "doctor shopping" until she is diagnosed with the disease. Nicole does not report any disruptions in her academic, social, or work life. Given this information, Nicole's diagnosis would bea. schizophreniform disorderb. schizoaffective disorderc. shared psychotic disorderd. delusional disorder