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
Vegetations on undersurface of A.V. valves are found in: 
Select and explain. 
A. Acute Rheumatic corditis, B. Limban Sack's endocarditis, C. Non thrombotic bacterial endocarditis, D. Chronic rheumatic carditis
B: Limban Sack's endocarditis
Answer: B: Limban Sack's endocarditis 
Explanation: Answer is B (Libman Sacks Endocarditis) Vegetation on under-surface of AV valves are typically seen in Libman Sacks Endocarditis (SLE).