This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, 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: Answer is B (Decreased QT interval) Hypercalcemia is characterized by a decreased QT interval.', 'role': 'assistant'}]