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
Left axis detion is seen in all except 
Select and explain. 
A. Left anterior hemi block, B. Inferior wall MI, C. ASD (Septum secundum), D. Right pneumothorax
C: ASD (Septum secundum)
Answer: C: ASD (Septum secundum) 
Explanation: Ans. is 'c' i.e., ASD (Septum secundum) Cause of right axis detion Causes of left axis detion Left posterior, fascicular block Left ventricular hyperophy Lateral myocardial infarction Left anterior fascicular block ASD septum secondum Inferior wall MI Right ventricular hyperophy Ostium primum ASD Acute lung disease (e.g. PE) Left bundle branch block Chronic lung disease (e.g. COPD) WPW type A Ventricular ectopy Hyperkalaemia Sodium-channel blocker toxicity WPW syndrome Normal in children or thin adults with a horizontally positioned hea