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
The normal P wave is biphasic in lead: 
Select and explain. 
A. VI, B. LII, C. aVF, D. aVR
A: VI
Answer: A: VI 
Explanation: Answer. A (VI): Normal P wave may be seen as a Biphasic wave in lead V1. 'The normal P wave in lead V1 may be biphasic with a positive component reflecting right atrial depolarization followed by a small (<1 mm') negative component reflecting left atrial depolarization' - Harrison Note: The normal P wave is negative (inveed) in lead aVR.