High risk lesions for Infective Endocarditis are all except:-: (A) Prosthetic heart valves, (B) Prior history of infective endocarditis, (C) Aortic regurgitation, (D) Complex cyanotic congenital heart disease
Answer is C. 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.