This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Hypercalcaemia in ECG is diagnosed by \nSelect and explain. \nA. Increased QT interval, B. Decreased QT interval, C. Increased PR interval, D. Tall T waves', 'role': 'user'}, {'content': 'Answer: B \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 1532', 'role': 'assistant'}]