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': 'In acute pulmonary embolism, the most frequent ECG finding is \nSelect and explain. \nA. S1Q3T3 pattern, B. P. pulmonale, C. Sinus tachycardia, D. Right axis detion', 'role': 'user'}, {'content': "Answer: C \nExplanation: The most frequently cited abnormality in pulmonary embolism is sinus tachycardia.Apa from that,it also shows S1Q3T3 sign-an S wave in lead I,a Q wave in lead III,and an inveed T wave in lead III.This finding is relatively specific. S1Q3T3 pattern in ECG of pulmonary embolism is also termed as Mc Ginn White Sign. Reference:Harrison's medicine-18th edition,page no:2172.", 'role': 'assistant'}]