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
Which is not a finding in a massive left sided pneumothorax? 
Select and explain. 
A. Absent R wave, B. T wave inversion, C. ST segment change, D. Left axis detion
D: Left axis detion
Answer: D: Left axis detion 
Explanation: The ECG pattern in the left sided group has been more conspicuous and more striking, and has consisted of a lower voltage of QRS-1, flattening of T waves in Lead 1, a change in the contour of QRS complexes in the chest leads, and a definite inversion of T waves in the chest leads; these T wave inversions being the most constant and conspicuous of all changes. There will be right axis detion with Q waves in the anterior leads. It may mimic acute myocardial infarction. The ECG pattern in the right sided group has been mainly depression of QRS-1, and depression of P waves in the limb leads. T inversion has been notably absent.