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
QT interval is shortened in - 
Select and explain. 
A. Hypocalcaemia, B. Hypokalemia, C. Hypercalcemia, D. Hyperkalemia
C: Hypercalcemia
Answer: C: Hypercalcemia 
Explanation: None