This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
A 30-year-old lady C/O sudden onset of breathlessness, anxiety, palpitation and feeling of impending doom. Physical examination is normal. Diagnosis is: September 2012 
Select and explain. 
A. Panic attack, B. Anxitey disorder, C. Conversion disorder, D. Acute psychosis
A: Panic attack
Answer: A: Panic attack 
Explanation: Ans. A i.e. Panic attack