This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Feature of Torsade de pointes is: 
Select and explain. 
A. Wide QRS complex, B. Sho QRS complex, C. Sho QRS complex, D. Sho QTc interval
C: Sho QRS complex
Answer: C: Sho QRS complex 
Explanation: Answer is C (Prolonged QTc interval) `The ECG hallmark of torsades depoint's is marked QT prolongation'. `Torsades de pointes' or 'twisting of the points' is a specific type of ventricular tachycardia Characteristics of Torsades de pointes Polymorphic QRS complexes that change in amplitude Cycle length giving the appearance of oscillations around the baseline. Marked QT prolongation Q