A 19-year-old college student, Todd, is brought to your clin…

A 19-year-old college student, Todd, is brought to your clinic by his mother. She has noticed for the past three months his grades have declined in college and he has missed classes. He has become withdrawn and does not spend time with his friends as he usually would. His past medical history is unremarkable. His appearance is unkempt and he repeatedly has hyperactive movements. The remainder of his physical examination reveals no other abnormalities. When you question him on how he is feeling, he says that he is very worried that Microsoft has stolen software he created and relates there is a black van that follows him when he is out. He tells you he hears  voices telling to leave the office. Which of the following is the most likely diagnosis given Todd’s presentation?