This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmias 1, Subject name: Medicine
[{'content': 'In a normal ECG which lead does it represent? \nSelect and explain. \nA. aVL, B. aVR, C. V1, D. V6', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The aVR is often neglected lead. It is an unipolar lead facing the right superior surface. As all the depolarization are going away from lead aVR, all waves are negative in aVR (P, QRS, T) in normal sinus rhythm.', 'role': 'assistant'}]