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': 'The normal P wave is inveed in lead \nSelect and explain. \nA. LI, B. LII, C. aVF, D. aVR', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Since this vector points toward the positive pole of lead II and toward the negative pole of lead aVR, the normal P wave will be positive in lead II and negative in lead aVR Ref Harrison 20th edition pg 1456', 'role': 'assistant'}]