This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Which of the following ECG changes is least likely in a patient with left pneumothorax-(/i//MS 
Select and explain. 
A. Inversion of Twave, B. Left axis detion, C. Small R wave, D. Electrical altemans
B: Left axis detion
Answer: B: Left axis detion 
Explanation: Abnormal left axis detion was found with left-sided was pneumothorax .Relevant QRS abnormalities (incomplete RBBB and T-wave inversion)in (10%). QRS amplitude in V2-V6 leads was significantly decreased in left-sided pneumothorax. Ref Harrison 20th edition pg 1536