Fill in the blank. Choose from: bulimia nervosa; anorexia nervosa; seasonal affective disorder (SAD); persistent depressive disorder bipolar disorder; major depressive disorder; cyclothymic disorder. since moving to Fairbanks, Alaska, five years ago, Jon has experienced episodes of depression during the fall and winter months. Jon may be experiencing

In this case, we know that Jon experiences episodes of depression during fall and winter months after moving to Fairbanks, Alaska. We need to select the most appropriate disorder from the given list that matches this situation.

Let's go through the given list of disorders and see which one fits Jon's situation: 1. Bulimia Nervosa - This is related to eating disorders and cannot explain Jon's symptoms. 2. Anorexia Nervosa - This is also related to eating disorders and is not suitable for Jon's case. 3. Seasonal Affective Disorder (SAD) - This disorder is characterized by depressive episodes occurring during specific seasons, usually fall and winter months, due to reduced sunlight exposure. This matches Jon's symptoms. 4. Persistent Depressive Disorder - This disorder refers to a continuous and long-term depressive mood, and does not consider seasonality. 5. Bipolar Disorder - This disorder involves episodes of depression and mania. Since we only know about Jon's depressive episodes, we cannot identify this as a bipolar disorder. 6. Major Depressive Disorder - This disorder is characterized by severe depression episodes, but does not consider seasonality. 7. Cyclothymic Disorder - This disorder is characterized by alternating periods of depressive and hypomanic symptoms but, just like bipolar disorder, we only know about Jon's depressive episodes.

Based on the analysis, Jon's symptoms most closely match Seasonal Affective Disorder (SAD) as it is the only disorder among the given ones that explains the episodes of depression during fall and winter months. Therefore, Jon may be experiencing: Seasonal Affective Disorder (SAD).