This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anxiety disorders stress disorders and grief, Subject name: Psychiatry
Male with symptoms mimicking hea disease with normal ECG and X-ray, the diagnosis is 
Select and explain. 
A. Angina Pectoris, B. Panic attack, C. ANS instability, D. Vasovagal attack
B: Panic attack
Answer: B: Panic attack 
Explanation: A 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. The episode is usually sudden in onset, lasts for few minutes and is characterised by very severe anxiety. (Ref: a sho textbook of psychiatry, Niraj Ahuja, 7th edition, pg no.90)