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 do sudden onset breathlessness, anxiety, palpitation & feeling of impending doom. Physical examination is normal. What is the diagnosis - 
Select and explain. 
A. Panic attack, B. Anxiety disorder, C. Conversion disorder, D. Acute psychosis
A: Panic attack
Answer: A: Panic attack 
Explanation: Sudden onset of breathlessness, anxiety, palpitation and feeling of impending doom suggest the diagnosis of panic attack (severe anxiety)