This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Anatomy
Vegetations on under surface of cusps are found in: 
Select and explain. 
A. Infective endocarditis, B. Libman sacks endocaditis, C. SABE, D. Rheumatic fever
B: Libman sacks endocaditis
Answer: B: Libman sacks endocaditis 
Explanation: Vegetations in Libmann sacks endocarditis occur on surfaces of cusps.Both surfaces may be involved but more commonly the undersurface is affected .(ref Robbins 7th/597,89,9/e p558)