This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': 'V wave in left atrium is higher than in right atrium becasuse \nSelect and explain. \nA. Left side is high pressure system, B. Left atrium good compliance with pulmonary vein, C. Something due to poor transit through lung for atrium, D. Right side is a high pressure system', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Left atrial waveform is very similar to right atrium however a wave and v wave are larger because of lower compliance in left atrium v wave represents the passive filling of atria.', 'role': 'assistant'}]