This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thromboembolism and Fat Embolism Syndrome, Subject name: Medicine
[{'content': 'What is the most common ECG finding for pulmonary embolism? \nSelect and explain. \nA. Sinus tachycardia, B. S1 Q3 T3, C. T wave inversion, D. Epsilon waves', 'role': 'user'}, {'content': 'Answer: A \nExplanation: M/C ECG abnormality in pulmonary embolism- Sinus tachycardia M/C symptom is unexplained breathlessness. Screening test - D-dimer test. Most specific finding is S1Q3T3. The classic findings of right hea strain and acute cor pulmonale are tall, peaked P waves in lead II (P pulmonale); right axis detion; right bundle-branch block and S1Q3T3 pattern.', 'role': 'assistant'}]