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': 'Tall R wave in ECG represents: \nSelect and explain. \nA. Right atrial overload, B. Left atrial overload, C. Right ventricular hypertrophy, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Right ventricular hypertrophy due to a sustained, severe pressure load (e.g. due to right pulmonary valve stenosis or certain pulmonary artery hypertension syndromes) is characterized by a relatively tall R wave in lead V,\xa0(R >S wave),\xa0usually with right axis deviation.', 'role': 'assistant'}]