A 40-Year-Old Man Presented to the Office Complaining of Insomnia

A 40-year-old man presented to the office complaining of insomnia for the last month. He lost his job 6 weeks ago and started feeling low mood, irritability, and guilt. He stays in bed most of the time. He has lost 4.5 kg over the last month. The patient noticed decreased concentration. Physical examination is normal. Which of the following is the most likely diagnosis in this patient?

A) Adjustment disorder with depressed mood
B) Bipolar II disorder
C) Depressive disorder due to another medical condition
D) Major depressive disorder
E) Persistent depressive disorder
F) Premenstrual dysphoric disorder
G) Substance-induced depressive disorder