This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Which of the following is seen in torsades de pointes 
Select and explain. 
A. Hypermagnesemia, B. Sho QRS complex, C. Prolonged QTc interval, D. PQ segment
C: Prolonged QTc interval
Answer: C: Prolonged QTc interval 
Explanation: Torsades de pointes is a complication of prolonged ventricular repolarisation(prolonged QT interval. QT interval >0.44sec in men, >0.46sec in women. Reference: Harrison 20th edition pg 1445