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': 'Which of the following ECG changes is least likely in a patient with left pneumothorax : \nSelect and explain. \nA. Inversion of T wave, B. Left axis detion, C. Small Rwave, D. Electrical alternans', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer is B (Left axis detion) A left sided pneumothorax will shift the axis of the hea towards the right leading to a right axis detion rather than a left axis detion.', 'role': 'assistant'}]