This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology and CVS, Subject name: Pharmacology
Surinder singh developed acute CHF and was put on digitalis therapy. ECG of this patient revealed the presence of ventricular extrasystoles. Which of the following drugs can be administered safely to this patient in order to counteract this arrhythmia? 
Select and explain. 
A. Lignocaine, B. Quinidine, C. Atropine, D. Amiodarone
A: Lignocaine
Answer: A: Lignocaine 
Explanation: Lignocaine is the DOC for ventricular arrhythmias due to digitalis toxicity. Lidocaine is also used as emergency treatment of myocardial infarction arrhythmias