This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Which of the following drugs can cause torsedes points 
Select and explain. 
A. Quinidine, B. Lignocaine, C. Esmolol, D. Flecainide
A: Quinidine
Answer: A: Quinidine 
Explanation: Torsedes'de point is a polymorphic ventricular tachycardia that is usually caused due to blockade of delayed rectifier potassium channels in the hea It manifest in ECG as QTc prolongation Drugs having cardiac potassium channel blocking activity can cause this Arrythymia. These include : Class 1a anti Arrythymics:quinidine,procainamide( Sodium and potassium channel blocker) Class 3 anti arrhythmia:bretylium,sotalol. Other drugs like terfenadine ,cisapride Refer katzung 10e 224, KDT 6/e 510