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. Short QRS complex, C. Prolonged QTc interval, D. Short QTc interval
C: Prolonged QTc interval
Answer: C: Prolonged QTc interval 
Explanation: None