MSFinals-5542

A 26-year-old man is brought to his GP by his father as he is worried that his son has become socially withdrawn since puberty. Despite being regularly invited, he doesn’t participate in after-work events. His father recently became concerned when his son stated that he doesn’t need or want any friends. The patient has no significant medical history, denies alcohol dependence, and has recently been promoted at work. During the consultation, he remains with his arms folded and does not engage. There is no evidence of affection towards his father when he expresses his concern. What is the most likely diagnosis for this patient?