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: Pediatrics
Severity of Aortic stenosis is determined by ?a) Late ejection systolic murmurb) ST –T changesc) LV Hypertrophy with displaced apexd)  None 
Select and explain. 
A. ac, B. ab, C. ad, D. bc
B: ab
Answer: B: ab 
Explanation: None