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': 'In left sided massive pneumotliorax, ECG shows all,except - \nSelect and explain. \nA. Left axis deviation, B. Absent R wave, C. Peaked P wave, D. Precordial T wave inversion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]