____, a subset of polymorphic ventricular tachycardia, occurs with patients who either have congenital prolonged QT syndromes, or who have a drug-induced QT interval prolongation.
A. Polymorphic ventricular tachycardia
B. Torsades de pointes (TdP)
C. Ventricular bigeminy
D. Wolff-Parkinson-White syndrome
Answer: B
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