This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
,70yr old male with history of HTN and DM developed the following rhythm with Bp 90/ 40 mm Hg and feeble pulse what is the next step of management 
Select and explain. 
A. IV adenosine, B. IV Diltiazem, C. DC cardioversion, D. Ibuteilide
C: DC cardioversion
Answer: C: DC cardioversion 
Explanation: ECG : SVT REF : HARISSONS 21ST ED