This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pharmacology
Lignocaine is useful: 
Select and explain. 
A. Atrial fibrillation, B. PSVT, C. Digitalis induced toxicity, D. All of the above
C: Digitalis induced toxicity
Answer: C: Digitalis induced toxicity 
Explanation: Ans. C. Digitalis induced toxicityDOC for atrial fibrillation- verapamil. PSVT- adenosine, Digitalis induced toxicity- lignocaine.