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
[{'content': 'QT interval is shoens in \nSelect and explain. \nA. Hypocalcaemia, B. Hypokalemia, C. Hypercalcaemia, D. Hyperkalemia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]