<prompt> A 30 - year - old lady complains of sudden onset breathlessness, anxiety, palpitations and feeling of impending doom. Physical examination is normal. What is the diagnosis?Acute psychosisAnxiety disorderConversion disorderPanic attack  <response>: Panic disorder is characterised by discrete episodes of acute anxiety. The onset is usually in the early third decade with often a chronic course. The panic attacks occur recurrently every few days. They may or may not have any underlying generalised anxiety disorder.The episode is usually sudden in onset, lasts for a few minutes and is characterised by very severe anxiety. 