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
–30°– 60° left axis deviation – 
Select and explain. 
A. Left ventricular hypertrophy, B. Right ventricular hypertrophy, C. Aortic stenosis, D. Left atrial enlargement.
A: Left ventricular hypertrophy
Answer: A: Left ventricular hypertrophy 
Explanation: None