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
[{'content': 'Feature of Torsade de pointes is: \nSelect and explain. \nA. Wide QRS complex, B. Sho QRS complex, C. Sho QRS complex, D. Sho QTc interval', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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", 'role': 'assistant'}]