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': 'Current of injury is - \nSelect and explain. \nA. P wave, B. ST segment, C. QRS complex, D. QT interval', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]