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': 'Hypocalcaemia is characterized by the following features except \nSelect and explain. \nA. Numbness and tingling of circumoral region, B. Hyperactivity tendon reflexes, C. Shoing of QT interval in ECG, D. Carpopedal spasm', '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 1421', 'role': 'assistant'}]