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
High risk lesions for Infective Endocarditis are all except:- 
Select and explain. 
A. Prosthetic heart valves, B. Prior history of infective endocarditis, C. Aortic regurgitation, D. Complex cyanotic congenital heart disease
C: Aortic regurgitation
Answer: C: Aortic regurgitation 
Explanation: High risk lesions for IE requiring antibiotic prophylaxis for surgical procedures:- 
i. Prosthetic heart valves.
ii. Prior endocarditis.
iii. Unrepaired cyanotic congenital heart disease(CCHD).
iv. Completely repaired CCHD during the 6 months after repair.
v. Incompletely repaired CCHD with residual defects - Valvulopathy developing after cardiac transplantation.