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 interval is shoens in 
Select and explain. 
A. Hypocalcaemia, B. Hypokalemia, C. Hypercalcaemia, D. Hyperkalemia
C: Hypercalcaemia
Answer: C: Hypercalcaemia 
Explanation: Hypocalcemia typically prolongs the QT interval (ST poion), whereas hypercalcemia shoens it . Digitalis glycosides also shoen the QT interval, often with a characteristic "scooping" of the ST-T-wave complex (digitalis effect). Ref Harrison 20th edition pg 1567