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
Most common cardiac defect in Turner syndrome 
Select and explain. 
A. Pretruncal coarctation of aorta, B. Bicuspid aortic valve, C. Hypoplastic left heart, D. Mitral regurgitation
B: Bicuspid aortic valve
Answer: B: Bicuspid aortic valve 
Explanation: B > A