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
Qt. prolonged is associated with - 
Select and explain. 
A. Hypercalcemia, B. Type la anti arrythmic drugs, C. Torsade de pointes, D. Atrial fibrillation
B: Type la anti arrythmic drugs
Answer: B: Type la anti arrythmic drugs 
Explanation: Ref Harrison 20th edition pg 1423