They appear as they were initially reviewed by admissions officers.
Many people look back in time to find the moment of their initial inspiration.
Some people have wanted to be a doctor so long they do not even know what originally inspired them. To incorporate this theme, look back to the material you gathered in the last chapter, specifically in response to The Chronological Method, Note Major Influences, and Identify Your Goals. This is perhaps the most common approach of all. The secret to doing it well is to show, not just tell, why you want to be a doctor. You cannot just say it and expect it to stand on its own.