A Mother Brings Her 18-Year-Old Man to the Clinic Since

A mother brings her 18-year-old man to the clinic since he has been acting strangely for the previous two months. The patient is in his first semester at an out-of-state college and is struggling to acclimate to his new surroundings. He hasn't attended to class in a few weeks, and he hasn't socialized with his pals. Because he feels the cafeteria food is tainted, the patient spends much of his time alone in his dorm room and eats very little. He has no serious medical or mental background, and he does not drink or use illegal substances. The physical exam is ordinary. During a mental state test, he seems unkempt with unclean hair, makes poor eye contact, and responds with "leave me alone." Which of the following is the most likely diagnosis in this patient?

A) Adjustment disorder
B) Brief psychotic disorder
C) Delusional disorder
D) Major depressive disorder with psychotic features
E) Schizophrenia
F) Schizophreniform disorder