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': 'Hypercalcemia 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: The main ECG abnormality seen with hypercalcaemia is shoening of QT interval In severe hypercalcaemia, Osborn wave (J waves) may be seen Ventricular irritability and VF arrest has been repoed with extreme hypercalcaemia Increased PR interval and tall T waves are not seen in hypercalcemia Ref Harrison 20th edition pg 1523', 'role': 'assistant'}]