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: Radiology
70yr old male with his HTN and DM developed the following rhythm with Bp 90 40 mm Hg and feeble pulse what is the next step of management *diagram 
Select and explain. 
A. IV adenosine, B. IV Diltiagens, C. DC cardioversion, D. Ibuteilide
C: DC cardioversion
Answer: C: DC cardioversion 
Explanation: Ecg shows unstable SVT -CDC cardio version should be done